1462 lines
53 KiB
Plaintext
Executable File
1462 lines
53 KiB
Plaintext
Executable File
ThinkPad ACPI Extras Driver
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Version 0.25
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October 16th, 2013
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Borislav Deianov <borislav@users.sf.net>
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Henrique de Moraes Holschuh <hmh@hmh.eng.br>
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http://ibm-acpi.sf.net/
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This is a Linux driver for the IBM and Lenovo ThinkPad laptops. It
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supports various features of these laptops which are accessible
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through the ACPI and ACPI EC framework, but not otherwise fully
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supported by the generic Linux ACPI drivers.
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This driver used to be named ibm-acpi until kernel 2.6.21 and release
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0.13-20070314. It used to be in the drivers/acpi tree, but it was
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moved to the drivers/misc tree and renamed to thinkpad-acpi for kernel
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2.6.22, and release 0.14. It was moved to drivers/platform/x86 for
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kernel 2.6.29 and release 0.22.
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The driver is named "thinkpad-acpi". In some places, like module
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names and log messages, "thinkpad_acpi" is used because of userspace
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issues.
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"tpacpi" is used as a shorthand where "thinkpad-acpi" would be too
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long due to length limitations on some Linux kernel versions.
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Status
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------
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The features currently supported are the following (see below for
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detailed description):
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- Fn key combinations
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- Bluetooth enable and disable
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- video output switching, expansion control
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- ThinkLight on and off
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- CMOS/UCMS control
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- LED control
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- ACPI sounds
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- temperature sensors
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- Experimental: embedded controller register dump
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- LCD brightness control
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- Volume control
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- Fan control and monitoring: fan speed, fan enable/disable
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- WAN enable and disable
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- UWB enable and disable
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A compatibility table by model and feature is maintained on the web
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site, http://ibm-acpi.sf.net/. I appreciate any success or failure
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reports, especially if they add to or correct the compatibility table.
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Please include the following information in your report:
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- ThinkPad model name
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- a copy of your ACPI tables, using the "acpidump" utility
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- a copy of the output of dmidecode, with serial numbers
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and UUIDs masked off
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- which driver features work and which don't
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- the observed behavior of non-working features
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Any other comments or patches are also more than welcome.
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Installation
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------------
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If you are compiling this driver as included in the Linux kernel
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sources, look for the CONFIG_THINKPAD_ACPI Kconfig option.
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It is located on the menu path: "Device Drivers" -> "X86 Platform
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Specific Device Drivers" -> "ThinkPad ACPI Laptop Extras".
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Features
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--------
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The driver exports two different interfaces to userspace, which can be
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used to access the features it provides. One is a legacy procfs-based
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interface, which will be removed at some time in the future. The other
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is a new sysfs-based interface which is not complete yet.
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The procfs interface creates the /proc/acpi/ibm directory. There is a
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file under that directory for each feature it supports. The procfs
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interface is mostly frozen, and will change very little if at all: it
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will not be extended to add any new functionality in the driver, instead
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all new functionality will be implemented on the sysfs interface.
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The sysfs interface tries to blend in the generic Linux sysfs subsystems
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and classes as much as possible. Since some of these subsystems are not
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yet ready or stabilized, it is expected that this interface will change,
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and any and all userspace programs must deal with it.
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Notes about the sysfs interface:
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Unlike what was done with the procfs interface, correctness when talking
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to the sysfs interfaces will be enforced, as will correctness in the
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thinkpad-acpi's implementation of sysfs interfaces.
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Also, any bugs in the thinkpad-acpi sysfs driver code or in the
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thinkpad-acpi's implementation of the sysfs interfaces will be fixed for
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maximum correctness, even if that means changing an interface in
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non-compatible ways. As these interfaces mature both in the kernel and
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in thinkpad-acpi, such changes should become quite rare.
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Applications interfacing to the thinkpad-acpi sysfs interfaces must
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follow all sysfs guidelines and correctly process all errors (the sysfs
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interface makes extensive use of errors). File descriptors and open /
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close operations to the sysfs inodes must also be properly implemented.
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The version of thinkpad-acpi's sysfs interface is exported by the driver
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as a driver attribute (see below).
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Sysfs driver attributes are on the driver's sysfs attribute space,
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for 2.6.23+ this is /sys/bus/platform/drivers/thinkpad_acpi/ and
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/sys/bus/platform/drivers/thinkpad_hwmon/
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Sysfs device attributes are on the thinkpad_acpi device sysfs attribute
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space, for 2.6.23+ this is /sys/devices/platform/thinkpad_acpi/.
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Sysfs device attributes for the sensors and fan are on the
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thinkpad_hwmon device's sysfs attribute space, but you should locate it
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looking for a hwmon device with the name attribute of "thinkpad", or
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better yet, through libsensors.
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Driver version
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--------------
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procfs: /proc/acpi/ibm/driver
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sysfs driver attribute: version
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The driver name and version. No commands can be written to this file.
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Sysfs interface version
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-----------------------
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sysfs driver attribute: interface_version
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Version of the thinkpad-acpi sysfs interface, as an unsigned long
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(output in hex format: 0xAAAABBCC), where:
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AAAA - major revision
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BB - minor revision
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CC - bugfix revision
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The sysfs interface version changelog for the driver can be found at the
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end of this document. Changes to the sysfs interface done by the kernel
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subsystems are not documented here, nor are they tracked by this
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attribute.
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Changes to the thinkpad-acpi sysfs interface are only considered
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non-experimental when they are submitted to Linux mainline, at which
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point the changes in this interface are documented and interface_version
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may be updated. If you are using any thinkpad-acpi features not yet
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sent to mainline for merging, you do so on your own risk: these features
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may disappear, or be implemented in a different and incompatible way by
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the time they are merged in Linux mainline.
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Changes that are backwards-compatible by nature (e.g. the addition of
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attributes that do not change the way the other attributes work) do not
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always warrant an update of interface_version. Therefore, one must
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expect that an attribute might not be there, and deal with it properly
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(an attribute not being there *is* a valid way to make it clear that a
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feature is not available in sysfs).
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Hot keys
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--------
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procfs: /proc/acpi/ibm/hotkey
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sysfs device attribute: hotkey_*
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In a ThinkPad, the ACPI HKEY handler is responsible for communicating
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some important events and also keyboard hot key presses to the operating
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system. Enabling the hotkey functionality of thinkpad-acpi signals the
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firmware that such a driver is present, and modifies how the ThinkPad
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firmware will behave in many situations.
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The driver enables the HKEY ("hot key") event reporting automatically
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when loaded, and disables it when it is removed.
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The driver will report HKEY events in the following format:
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ibm/hotkey HKEY 00000080 0000xxxx
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Some of these events refer to hot key presses, but not all of them.
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The driver will generate events over the input layer for hot keys and
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radio switches, and over the ACPI netlink layer for other events. The
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input layer support accepts the standard IOCTLs to remap the keycodes
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assigned to each hot key.
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The hot key bit mask allows some control over which hot keys generate
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events. If a key is "masked" (bit set to 0 in the mask), the firmware
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will handle it. If it is "unmasked", it signals the firmware that
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thinkpad-acpi would prefer to handle it, if the firmware would be so
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kind to allow it (and it often doesn't!).
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Not all bits in the mask can be modified. Not all bits that can be
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modified do anything. Not all hot keys can be individually controlled
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by the mask. Some models do not support the mask at all. The behaviour
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of the mask is, therefore, highly dependent on the ThinkPad model.
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The driver will filter out any unmasked hotkeys, so even if the firmware
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doesn't allow disabling an specific hotkey, the driver will not report
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events for unmasked hotkeys.
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Note that unmasking some keys prevents their default behavior. For
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example, if Fn+F5 is unmasked, that key will no longer enable/disable
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Bluetooth by itself in firmware.
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Note also that not all Fn key combinations are supported through ACPI
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depending on the ThinkPad model and firmware version. On those
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ThinkPads, it is still possible to support some extra hotkeys by
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polling the "CMOS NVRAM" at least 10 times per second. The driver
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attempts to enables this functionality automatically when required.
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procfs notes:
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The following commands can be written to the /proc/acpi/ibm/hotkey file:
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echo 0xffffffff > /proc/acpi/ibm/hotkey -- enable all hot keys
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echo 0 > /proc/acpi/ibm/hotkey -- disable all possible hot keys
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... any other 8-hex-digit mask ...
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echo reset > /proc/acpi/ibm/hotkey -- restore the recommended mask
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The following commands have been deprecated and will cause the kernel
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to log a warning:
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echo enable > /proc/acpi/ibm/hotkey -- does nothing
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echo disable > /proc/acpi/ibm/hotkey -- returns an error
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The procfs interface does not support NVRAM polling control. So as to
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maintain maximum bug-to-bug compatibility, it does not report any masks,
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nor does it allow one to manipulate the hot key mask when the firmware
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does not support masks at all, even if NVRAM polling is in use.
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sysfs notes:
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hotkey_bios_enabled:
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DEPRECATED, WILL BE REMOVED SOON.
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Returns 0.
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hotkey_bios_mask:
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DEPRECATED, DON'T USE, WILL BE REMOVED IN THE FUTURE.
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Returns the hot keys mask when thinkpad-acpi was loaded.
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Upon module unload, the hot keys mask will be restored
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to this value. This is always 0x80c, because those are
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the hotkeys that were supported by ancient firmware
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without mask support.
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hotkey_enable:
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DEPRECATED, WILL BE REMOVED SOON.
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0: returns -EPERM
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1: does nothing
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hotkey_mask:
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bit mask to enable reporting (and depending on
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the firmware, ACPI event generation) for each hot key
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(see above). Returns the current status of the hot keys
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mask, and allows one to modify it.
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hotkey_all_mask:
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bit mask that should enable event reporting for all
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supported hot keys, when echoed to hotkey_mask above.
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Unless you know which events need to be handled
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passively (because the firmware *will* handle them
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anyway), do *not* use hotkey_all_mask. Use
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hotkey_recommended_mask, instead. You have been warned.
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hotkey_recommended_mask:
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bit mask that should enable event reporting for all
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supported hot keys, except those which are always
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handled by the firmware anyway. Echo it to
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hotkey_mask above, to use. This is the default mask
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used by the driver.
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hotkey_source_mask:
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bit mask that selects which hot keys will the driver
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poll the NVRAM for. This is auto-detected by the driver
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based on the capabilities reported by the ACPI firmware,
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but it can be overridden at runtime.
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Hot keys whose bits are set in hotkey_source_mask are
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polled for in NVRAM, and reported as hotkey events if
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enabled in hotkey_mask. Only a few hot keys are
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available through CMOS NVRAM polling.
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Warning: when in NVRAM mode, the volume up/down/mute
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keys are synthesized according to changes in the mixer,
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which uses a single volume up or volume down hotkey
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press to unmute, as per the ThinkPad volume mixer user
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interface. When in ACPI event mode, volume up/down/mute
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events are reported by the firmware and can behave
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differently (and that behaviour changes with firmware
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version -- not just with firmware models -- as well as
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OSI(Linux) state).
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hotkey_poll_freq:
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frequency in Hz for hot key polling. It must be between
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0 and 25 Hz. Polling is only carried out when strictly
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needed.
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Setting hotkey_poll_freq to zero disables polling, and
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will cause hot key presses that require NVRAM polling
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to never be reported.
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Setting hotkey_poll_freq too low may cause repeated
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pressings of the same hot key to be misreported as a
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single key press, or to not even be detected at all.
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The recommended polling frequency is 10Hz.
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hotkey_radio_sw:
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If the ThinkPad has a hardware radio switch, this
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attribute will read 0 if the switch is in the "radios
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disabled" position, and 1 if the switch is in the
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"radios enabled" position.
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This attribute has poll()/select() support.
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hotkey_tablet_mode:
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If the ThinkPad has tablet capabilities, this attribute
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will read 0 if the ThinkPad is in normal mode, and
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1 if the ThinkPad is in tablet mode.
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This attribute has poll()/select() support.
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wakeup_reason:
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Set to 1 if the system is waking up because the user
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requested a bay ejection. Set to 2 if the system is
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waking up because the user requested the system to
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undock. Set to zero for normal wake-ups or wake-ups
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due to unknown reasons.
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This attribute has poll()/select() support.
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wakeup_hotunplug_complete:
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Set to 1 if the system was waken up because of an
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undock or bay ejection request, and that request
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was successfully completed. At this point, it might
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be useful to send the system back to sleep, at the
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user's choice. Refer to HKEY events 0x4003 and
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0x3003, below.
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This attribute has poll()/select() support.
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input layer notes:
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A Hot key is mapped to a single input layer EV_KEY event, possibly
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followed by an EV_MSC MSC_SCAN event that shall contain that key's scan
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code. An EV_SYN event will always be generated to mark the end of the
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event block.
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Do not use the EV_MSC MSC_SCAN events to process keys. They are to be
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used as a helper to remap keys, only. They are particularly useful when
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remapping KEY_UNKNOWN keys.
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The events are available in an input device, with the following id:
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Bus: BUS_HOST
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vendor: 0x1014 (PCI_VENDOR_ID_IBM) or
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0x17aa (PCI_VENDOR_ID_LENOVO)
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product: 0x5054 ("TP")
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version: 0x4101
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The version will have its LSB incremented if the keymap changes in a
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backwards-compatible way. The MSB shall always be 0x41 for this input
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device. If the MSB is not 0x41, do not use the device as described in
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this section, as it is either something else (e.g. another input device
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exported by a thinkpad driver, such as HDAPS) or its functionality has
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been changed in a non-backwards compatible way.
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Adding other event types for other functionalities shall be considered a
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backwards-compatible change for this input device.
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Thinkpad-acpi Hot Key event map (version 0x4101):
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ACPI Scan
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event code Key Notes
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0x1001 0x00 FN+F1 -
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0x1002 0x01 FN+F2 IBM: battery (rare)
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Lenovo: Screen lock
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0x1003 0x02 FN+F3 Many IBM models always report
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this hot key, even with hot keys
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disabled or with Fn+F3 masked
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off
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IBM: screen lock, often turns
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off the ThinkLight as side-effect
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Lenovo: battery
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0x1004 0x03 FN+F4 Sleep button (ACPI sleep button
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semantics, i.e. sleep-to-RAM).
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It always generates some kind
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of event, either the hot key
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event or an ACPI sleep button
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event. The firmware may
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refuse to generate further FN+F4
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key presses until a S3 or S4 ACPI
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sleep cycle is performed or some
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time passes.
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0x1005 0x04 FN+F5 Radio. Enables/disables
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the internal Bluetooth hardware
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and W-WAN card if left in control
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of the firmware. Does not affect
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the WLAN card.
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Should be used to turn on/off all
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radios (Bluetooth+W-WAN+WLAN),
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really.
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0x1006 0x05 FN+F6 -
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0x1007 0x06 FN+F7 Video output cycle.
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Do you feel lucky today?
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0x1008 0x07 FN+F8 IBM: toggle screen expand
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Lenovo: configure UltraNav,
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or toggle screen expand
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0x1009 0x08 FN+F9 -
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.. .. ..
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0x100B 0x0A FN+F11 -
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0x100C 0x0B FN+F12 Sleep to disk. You are always
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supposed to handle it yourself,
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either through the ACPI event,
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or through a hotkey event.
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The firmware may refuse to
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generate further FN+F12 key
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press events until a S3 or S4
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ACPI sleep cycle is performed,
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or some time passes.
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0x100D 0x0C FN+BACKSPACE -
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0x100E 0x0D FN+INSERT -
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0x100F 0x0E FN+DELETE -
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0x1010 0x0F FN+HOME Brightness up. This key is
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always handled by the firmware
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in IBM ThinkPads, even when
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unmasked. Just leave it alone.
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For Lenovo ThinkPads with a new
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BIOS, it has to be handled either
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by the ACPI OSI, or by userspace.
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The driver does the right thing,
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never mess with this.
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0x1011 0x10 FN+END Brightness down. See brightness
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up for details.
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0x1012 0x11 FN+PGUP ThinkLight toggle. This key is
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always handled by the firmware,
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even when unmasked.
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0x1013 0x12 FN+PGDOWN -
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0x1014 0x13 FN+SPACE Zoom key
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0x1015 0x14 VOLUME UP Internal mixer volume up. This
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key is always handled by the
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firmware, even when unmasked.
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NOTE: Lenovo seems to be changing
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this.
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0x1016 0x15 VOLUME DOWN Internal mixer volume up. This
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key is always handled by the
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firmware, even when unmasked.
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NOTE: Lenovo seems to be changing
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this.
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0x1017 0x16 MUTE Mute internal mixer. This
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key is always handled by the
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firmware, even when unmasked.
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0x1018 0x17 THINKPAD ThinkPad/Access IBM/Lenovo key
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0x1019 0x18 unknown
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.. .. ..
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0x1020 0x1F unknown
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The ThinkPad firmware does not allow one to differentiate when most hot
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keys are pressed or released (either that, or we don't know how to, yet).
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For these keys, the driver generates a set of events for a key press and
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immediately issues the same set of events for a key release. It is
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unknown by the driver if the ThinkPad firmware triggered these events on
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hot key press or release, but the firmware will do it for either one, not
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both.
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If a key is mapped to KEY_RESERVED, it generates no input events at all.
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If a key is mapped to KEY_UNKNOWN, it generates an input event that
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includes an scan code. If a key is mapped to anything else, it will
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generate input device EV_KEY events.
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In addition to the EV_KEY events, thinkpad-acpi may also issue EV_SW
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events for switches:
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SW_RFKILL_ALL T60 and later hardware rfkill rocker switch
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SW_TABLET_MODE Tablet ThinkPads HKEY events 0x5009 and 0x500A
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Non hotkey ACPI HKEY event map:
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-------------------------------
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|
|
Events that are never propagated by the driver:
|
|
|
|
0x2304 System is waking up from suspend to undock
|
|
0x2305 System is waking up from suspend to eject bay
|
|
0x2404 System is waking up from hibernation to undock
|
|
0x2405 System is waking up from hibernation to eject bay
|
|
0x5001 Lid closed
|
|
0x5002 Lid opened
|
|
0x5009 Tablet swivel: switched to tablet mode
|
|
0x500A Tablet swivel: switched to normal mode
|
|
0x5010 Brightness level changed/control event
|
|
0x6000 KEYBOARD: Numlock key pressed
|
|
0x6005 KEYBOARD: Fn key pressed (TO BE VERIFIED)
|
|
0x7000 Radio Switch may have changed state
|
|
|
|
|
|
Events that are propagated by the driver to userspace:
|
|
|
|
0x2313 ALARM: System is waking up from suspend because
|
|
the battery is nearly empty
|
|
0x2413 ALARM: System is waking up from hibernation because
|
|
the battery is nearly empty
|
|
0x3003 Bay ejection (see 0x2x05) complete, can sleep again
|
|
0x3006 Bay hotplug request (hint to power up SATA link when
|
|
the optical drive tray is ejected)
|
|
0x4003 Undocked (see 0x2x04), can sleep again
|
|
0x4010 Docked into hotplug port replicator (non-ACPI dock)
|
|
0x4011 Undocked from hotplug port replicator (non-ACPI dock)
|
|
0x500B Tablet pen inserted into its storage bay
|
|
0x500C Tablet pen removed from its storage bay
|
|
0x6011 ALARM: battery is too hot
|
|
0x6012 ALARM: battery is extremely hot
|
|
0x6021 ALARM: a sensor is too hot
|
|
0x6022 ALARM: a sensor is extremely hot
|
|
0x6030 System thermal table changed
|
|
0x6040 Nvidia Optimus/AC adapter related (TO BE VERIFIED)
|
|
|
|
Battery nearly empty alarms are a last resort attempt to get the
|
|
operating system to hibernate or shutdown cleanly (0x2313), or shutdown
|
|
cleanly (0x2413) before power is lost. They must be acted upon, as the
|
|
wake up caused by the firmware will have negated most safety nets...
|
|
|
|
When any of the "too hot" alarms happen, according to Lenovo the user
|
|
should suspend or hibernate the laptop (and in the case of battery
|
|
alarms, unplug the AC adapter) to let it cool down. These alarms do
|
|
signal that something is wrong, they should never happen on normal
|
|
operating conditions.
|
|
|
|
The "extremely hot" alarms are emergencies. According to Lenovo, the
|
|
operating system is to force either an immediate suspend or hibernate
|
|
cycle, or a system shutdown. Obviously, something is very wrong if this
|
|
happens.
|
|
|
|
|
|
Brightness hotkey notes:
|
|
|
|
Don't mess with the brightness hotkeys in a Thinkpad. If you want
|
|
notifications for OSD, use the sysfs backlight class event support.
|
|
|
|
The driver will issue KEY_BRIGHTNESS_UP and KEY_BRIGHTNESS_DOWN events
|
|
automatically for the cases were userspace has to do something to
|
|
implement brightness changes. When you override these events, you will
|
|
either fail to handle properly the ThinkPads that require explicit
|
|
action to change backlight brightness, or the ThinkPads that require
|
|
that no action be taken to work properly.
|
|
|
|
|
|
Bluetooth
|
|
---------
|
|
|
|
procfs: /proc/acpi/ibm/bluetooth
|
|
sysfs device attribute: bluetooth_enable (deprecated)
|
|
sysfs rfkill class: switch "tpacpi_bluetooth_sw"
|
|
|
|
This feature shows the presence and current state of a ThinkPad
|
|
Bluetooth device in the internal ThinkPad CDC slot.
|
|
|
|
If the ThinkPad supports it, the Bluetooth state is stored in NVRAM,
|
|
so it is kept across reboots and power-off.
|
|
|
|
Procfs notes:
|
|
|
|
If Bluetooth is installed, the following commands can be used:
|
|
|
|
echo enable > /proc/acpi/ibm/bluetooth
|
|
echo disable > /proc/acpi/ibm/bluetooth
|
|
|
|
Sysfs notes:
|
|
|
|
If the Bluetooth CDC card is installed, it can be enabled /
|
|
disabled through the "bluetooth_enable" thinkpad-acpi device
|
|
attribute, and its current status can also be queried.
|
|
|
|
enable:
|
|
0: disables Bluetooth / Bluetooth is disabled
|
|
1: enables Bluetooth / Bluetooth is enabled.
|
|
|
|
Note: this interface has been superseded by the generic rfkill
|
|
class. It has been deprecated, and it will be removed in year
|
|
2010.
|
|
|
|
rfkill controller switch "tpacpi_bluetooth_sw": refer to
|
|
Documentation/rfkill.txt for details.
|
|
|
|
|
|
Video output control -- /proc/acpi/ibm/video
|
|
--------------------------------------------
|
|
|
|
This feature allows control over the devices used for video output -
|
|
LCD, CRT or DVI (if available). The following commands are available:
|
|
|
|
echo lcd_enable > /proc/acpi/ibm/video
|
|
echo lcd_disable > /proc/acpi/ibm/video
|
|
echo crt_enable > /proc/acpi/ibm/video
|
|
echo crt_disable > /proc/acpi/ibm/video
|
|
echo dvi_enable > /proc/acpi/ibm/video
|
|
echo dvi_disable > /proc/acpi/ibm/video
|
|
echo auto_enable > /proc/acpi/ibm/video
|
|
echo auto_disable > /proc/acpi/ibm/video
|
|
echo expand_toggle > /proc/acpi/ibm/video
|
|
echo video_switch > /proc/acpi/ibm/video
|
|
|
|
NOTE: Access to this feature is restricted to processes owning the
|
|
CAP_SYS_ADMIN capability for safety reasons, as it can interact badly
|
|
enough with some versions of X.org to crash it.
|
|
|
|
Each video output device can be enabled or disabled individually.
|
|
Reading /proc/acpi/ibm/video shows the status of each device.
|
|
|
|
Automatic video switching can be enabled or disabled. When automatic
|
|
video switching is enabled, certain events (e.g. opening the lid,
|
|
docking or undocking) cause the video output device to change
|
|
automatically. While this can be useful, it also causes flickering
|
|
and, on the X40, video corruption. By disabling automatic switching,
|
|
the flickering or video corruption can be avoided.
|
|
|
|
The video_switch command cycles through the available video outputs
|
|
(it simulates the behavior of Fn-F7).
|
|
|
|
Video expansion can be toggled through this feature. This controls
|
|
whether the display is expanded to fill the entire LCD screen when a
|
|
mode with less than full resolution is used. Note that the current
|
|
video expansion status cannot be determined through this feature.
|
|
|
|
Note that on many models (particularly those using Radeon graphics
|
|
chips) the X driver configures the video card in a way which prevents
|
|
Fn-F7 from working. This also disables the video output switching
|
|
features of this driver, as it uses the same ACPI methods as
|
|
Fn-F7. Video switching on the console should still work.
|
|
|
|
UPDATE: refer to https://bugs.freedesktop.org/show_bug.cgi?id=2000
|
|
|
|
|
|
ThinkLight control
|
|
------------------
|
|
|
|
procfs: /proc/acpi/ibm/light
|
|
sysfs attributes: as per LED class, for the "tpacpi::thinklight" LED
|
|
|
|
procfs notes:
|
|
|
|
The ThinkLight status can be read and set through the procfs interface. A
|
|
few models which do not make the status available will show the ThinkLight
|
|
status as "unknown". The available commands are:
|
|
|
|
echo on > /proc/acpi/ibm/light
|
|
echo off > /proc/acpi/ibm/light
|
|
|
|
sysfs notes:
|
|
|
|
The ThinkLight sysfs interface is documented by the LED class
|
|
documentation, in Documentation/leds/leds-class.txt. The ThinkLight LED name
|
|
is "tpacpi::thinklight".
|
|
|
|
Due to limitations in the sysfs LED class, if the status of the ThinkLight
|
|
cannot be read or if it is unknown, thinkpad-acpi will report it as "off".
|
|
It is impossible to know if the status returned through sysfs is valid.
|
|
|
|
|
|
CMOS/UCMS control
|
|
-----------------
|
|
|
|
procfs: /proc/acpi/ibm/cmos
|
|
sysfs device attribute: cmos_command
|
|
|
|
This feature is mostly used internally by the ACPI firmware to keep the legacy
|
|
CMOS NVRAM bits in sync with the current machine state, and to record this
|
|
state so that the ThinkPad will retain such settings across reboots.
|
|
|
|
Some of these commands actually perform actions in some ThinkPad models, but
|
|
this is expected to disappear more and more in newer models. As an example, in
|
|
a T43 and in a X40, commands 12 and 13 still control the ThinkLight state for
|
|
real, but commands 0 to 2 don't control the mixer anymore (they have been
|
|
phased out) and just update the NVRAM.
|
|
|
|
The range of valid cmos command numbers is 0 to 21, but not all have an
|
|
effect and the behavior varies from model to model. Here is the behavior
|
|
on the X40 (tpb is the ThinkPad Buttons utility):
|
|
|
|
0 - Related to "Volume down" key press
|
|
1 - Related to "Volume up" key press
|
|
2 - Related to "Mute on" key press
|
|
3 - Related to "Access IBM" key press
|
|
4 - Related to "LCD brightness up" key press
|
|
5 - Related to "LCD brightness down" key press
|
|
11 - Related to "toggle screen expansion" key press/function
|
|
12 - Related to "ThinkLight on"
|
|
13 - Related to "ThinkLight off"
|
|
14 - Related to "ThinkLight" key press (toggle ThinkLight)
|
|
|
|
The cmos command interface is prone to firmware split-brain problems, as
|
|
in newer ThinkPads it is just a compatibility layer. Do not use it, it is
|
|
exported just as a debug tool.
|
|
|
|
|
|
LED control
|
|
-----------
|
|
|
|
procfs: /proc/acpi/ibm/led
|
|
sysfs attributes: as per LED class, see below for names
|
|
|
|
Some of the LED indicators can be controlled through this feature. On
|
|
some older ThinkPad models, it is possible to query the status of the
|
|
LED indicators as well. Newer ThinkPads cannot query the real status
|
|
of the LED indicators.
|
|
|
|
Because misuse of the LEDs could induce an unaware user to perform
|
|
dangerous actions (like undocking or ejecting a bay device while the
|
|
buses are still active), or mask an important alarm (such as a nearly
|
|
empty battery, or a broken battery), access to most LEDs is
|
|
restricted.
|
|
|
|
Unrestricted access to all LEDs requires that thinkpad-acpi be
|
|
compiled with the CONFIG_THINKPAD_ACPI_UNSAFE_LEDS option enabled.
|
|
Distributions must never enable this option. Individual users that
|
|
are aware of the consequences are welcome to enabling it.
|
|
|
|
Audio mute and microphone mute LEDs are supported, but currently not
|
|
visible to userspace. They are used by the snd-hda-intel audio driver.
|
|
|
|
procfs notes:
|
|
|
|
The available commands are:
|
|
|
|
echo '<LED number> on' >/proc/acpi/ibm/led
|
|
echo '<LED number> off' >/proc/acpi/ibm/led
|
|
echo '<LED number> blink' >/proc/acpi/ibm/led
|
|
|
|
The <LED number> range is 0 to 15. The set of LEDs that can be
|
|
controlled varies from model to model. Here is the common ThinkPad
|
|
mapping:
|
|
|
|
0 - power
|
|
1 - battery (orange)
|
|
2 - battery (green)
|
|
3 - UltraBase/dock
|
|
4 - UltraBay
|
|
5 - UltraBase battery slot
|
|
6 - (unknown)
|
|
7 - standby
|
|
8 - dock status 1
|
|
9 - dock status 2
|
|
10, 11 - (unknown)
|
|
12 - thinkvantage
|
|
13, 14, 15 - (unknown)
|
|
|
|
All of the above can be turned on and off and can be made to blink.
|
|
|
|
sysfs notes:
|
|
|
|
The ThinkPad LED sysfs interface is described in detail by the LED class
|
|
documentation, in Documentation/leds/leds-class.txt.
|
|
|
|
The LEDs are named (in LED ID order, from 0 to 12):
|
|
"tpacpi::power", "tpacpi:orange:batt", "tpacpi:green:batt",
|
|
"tpacpi::dock_active", "tpacpi::bay_active", "tpacpi::dock_batt",
|
|
"tpacpi::unknown_led", "tpacpi::standby", "tpacpi::dock_status1",
|
|
"tpacpi::dock_status2", "tpacpi::unknown_led2", "tpacpi::unknown_led3",
|
|
"tpacpi::thinkvantage".
|
|
|
|
Due to limitations in the sysfs LED class, if the status of the LED
|
|
indicators cannot be read due to an error, thinkpad-acpi will report it as
|
|
a brightness of zero (same as LED off).
|
|
|
|
If the thinkpad firmware doesn't support reading the current status,
|
|
trying to read the current LED brightness will just return whatever
|
|
brightness was last written to that attribute.
|
|
|
|
These LEDs can blink using hardware acceleration. To request that a
|
|
ThinkPad indicator LED should blink in hardware accelerated mode, use the
|
|
"timer" trigger, and leave the delay_on and delay_off parameters set to
|
|
zero (to request hardware acceleration autodetection).
|
|
|
|
LEDs that are known not to exist in a given ThinkPad model are not
|
|
made available through the sysfs interface. If you have a dock and you
|
|
notice there are LEDs listed for your ThinkPad that do not exist (and
|
|
are not in the dock), or if you notice that there are missing LEDs,
|
|
a report to ibm-acpi-devel@lists.sourceforge.net is appreciated.
|
|
|
|
|
|
ACPI sounds -- /proc/acpi/ibm/beep
|
|
----------------------------------
|
|
|
|
The BEEP method is used internally by the ACPI firmware to provide
|
|
audible alerts in various situations. This feature allows the same
|
|
sounds to be triggered manually.
|
|
|
|
The commands are non-negative integer numbers:
|
|
|
|
echo <number> >/proc/acpi/ibm/beep
|
|
|
|
The valid <number> range is 0 to 17. Not all numbers trigger sounds
|
|
and the sounds vary from model to model. Here is the behavior on the
|
|
X40:
|
|
|
|
0 - stop a sound in progress (but use 17 to stop 16)
|
|
2 - two beeps, pause, third beep ("low battery")
|
|
3 - single beep
|
|
4 - high, followed by low-pitched beep ("unable")
|
|
5 - single beep
|
|
6 - very high, followed by high-pitched beep ("AC/DC")
|
|
7 - high-pitched beep
|
|
9 - three short beeps
|
|
10 - very long beep
|
|
12 - low-pitched beep
|
|
15 - three high-pitched beeps repeating constantly, stop with 0
|
|
16 - one medium-pitched beep repeating constantly, stop with 17
|
|
17 - stop 16
|
|
|
|
|
|
Temperature sensors
|
|
-------------------
|
|
|
|
procfs: /proc/acpi/ibm/thermal
|
|
sysfs device attributes: (hwmon "thinkpad") temp*_input
|
|
|
|
Most ThinkPads include six or more separate temperature sensors but only
|
|
expose the CPU temperature through the standard ACPI methods. This
|
|
feature shows readings from up to eight different sensors on older
|
|
ThinkPads, and up to sixteen different sensors on newer ThinkPads.
|
|
|
|
For example, on the X40, a typical output may be:
|
|
temperatures: 42 42 45 41 36 -128 33 -128
|
|
|
|
On the T43/p, a typical output may be:
|
|
temperatures: 48 48 36 52 38 -128 31 -128 48 52 48 -128 -128 -128 -128 -128
|
|
|
|
The mapping of thermal sensors to physical locations varies depending on
|
|
system-board model (and thus, on ThinkPad model).
|
|
|
|
http://thinkwiki.org/wiki/Thermal_Sensors is a public wiki page that
|
|
tries to track down these locations for various models.
|
|
|
|
Most (newer?) models seem to follow this pattern:
|
|
|
|
1: CPU
|
|
2: (depends on model)
|
|
3: (depends on model)
|
|
4: GPU
|
|
5: Main battery: main sensor
|
|
6: Bay battery: main sensor
|
|
7: Main battery: secondary sensor
|
|
8: Bay battery: secondary sensor
|
|
9-15: (depends on model)
|
|
|
|
For the R51 (source: Thomas Gruber):
|
|
2: Mini-PCI
|
|
3: Internal HDD
|
|
|
|
For the T43, T43/p (source: Shmidoax/Thinkwiki.org)
|
|
http://thinkwiki.org/wiki/Thermal_Sensors#ThinkPad_T43.2C_T43p
|
|
2: System board, left side (near PCMCIA slot), reported as HDAPS temp
|
|
3: PCMCIA slot
|
|
9: MCH (northbridge) to DRAM Bus
|
|
10: Clock-generator, mini-pci card and ICH (southbridge), under Mini-PCI
|
|
card, under touchpad
|
|
11: Power regulator, underside of system board, below F2 key
|
|
|
|
The A31 has a very atypical layout for the thermal sensors
|
|
(source: Milos Popovic, http://thinkwiki.org/wiki/Thermal_Sensors#ThinkPad_A31)
|
|
1: CPU
|
|
2: Main Battery: main sensor
|
|
3: Power Converter
|
|
4: Bay Battery: main sensor
|
|
5: MCH (northbridge)
|
|
6: PCMCIA/ambient
|
|
7: Main Battery: secondary sensor
|
|
8: Bay Battery: secondary sensor
|
|
|
|
|
|
Procfs notes:
|
|
Readings from sensors that are not available return -128.
|
|
No commands can be written to this file.
|
|
|
|
Sysfs notes:
|
|
Sensors that are not available return the ENXIO error. This
|
|
status may change at runtime, as there are hotplug thermal
|
|
sensors, like those inside the batteries and docks.
|
|
|
|
thinkpad-acpi thermal sensors are reported through the hwmon
|
|
subsystem, and follow all of the hwmon guidelines at
|
|
Documentation/hwmon.
|
|
|
|
EXPERIMENTAL: Embedded controller register dump
|
|
-----------------------------------------------
|
|
|
|
This feature is not included in the thinkpad driver anymore.
|
|
Instead the EC can be accessed through /sys/kernel/debug/ec with
|
|
a userspace tool which can be found here:
|
|
ftp://ftp.suse.com/pub/people/trenn/sources/ec
|
|
|
|
Use it to determine the register holding the fan
|
|
speed on some models. To do that, do the following:
|
|
- make sure the battery is fully charged
|
|
- make sure the fan is running
|
|
- use above mentioned tool to read out the EC
|
|
|
|
Often fan and temperature values vary between
|
|
readings. Since temperatures don't change vary fast, you can take
|
|
several quick dumps to eliminate them.
|
|
|
|
You can use a similar method to figure out the meaning of other
|
|
embedded controller registers - e.g. make sure nothing else changes
|
|
except the charging or discharging battery to determine which
|
|
registers contain the current battery capacity, etc. If you experiment
|
|
with this, do send me your results (including some complete dumps with
|
|
a description of the conditions when they were taken.)
|
|
|
|
|
|
LCD brightness control
|
|
----------------------
|
|
|
|
procfs: /proc/acpi/ibm/brightness
|
|
sysfs backlight device "thinkpad_screen"
|
|
|
|
This feature allows software control of the LCD brightness on ThinkPad
|
|
models which don't have a hardware brightness slider.
|
|
|
|
It has some limitations: the LCD backlight cannot be actually turned
|
|
on or off by this interface, it just controls the backlight brightness
|
|
level.
|
|
|
|
On IBM (and some of the earlier Lenovo) ThinkPads, the backlight control
|
|
has eight brightness levels, ranging from 0 to 7. Some of the levels
|
|
may not be distinct. Later Lenovo models that implement the ACPI
|
|
display backlight brightness control methods have 16 levels, ranging
|
|
from 0 to 15.
|
|
|
|
For IBM ThinkPads, there are two interfaces to the firmware for direct
|
|
brightness control, EC and UCMS (or CMOS). To select which one should be
|
|
used, use the brightness_mode module parameter: brightness_mode=1 selects
|
|
EC mode, brightness_mode=2 selects UCMS mode, brightness_mode=3 selects EC
|
|
mode with NVRAM backing (so that brightness changes are remembered across
|
|
shutdown/reboot).
|
|
|
|
The driver tries to select which interface to use from a table of
|
|
defaults for each ThinkPad model. If it makes a wrong choice, please
|
|
report this as a bug, so that we can fix it.
|
|
|
|
Lenovo ThinkPads only support brightness_mode=2 (UCMS).
|
|
|
|
When display backlight brightness controls are available through the
|
|
standard ACPI interface, it is best to use it instead of this direct
|
|
ThinkPad-specific interface. The driver will disable its native
|
|
backlight brightness control interface if it detects that the standard
|
|
ACPI interface is available in the ThinkPad.
|
|
|
|
If you want to use the thinkpad-acpi backlight brightness control
|
|
instead of the generic ACPI video backlight brightness control for some
|
|
reason, you should use the acpi_backlight=vendor kernel parameter.
|
|
|
|
The brightness_enable module parameter can be used to control whether
|
|
the LCD brightness control feature will be enabled when available.
|
|
brightness_enable=0 forces it to be disabled. brightness_enable=1
|
|
forces it to be enabled when available, even if the standard ACPI
|
|
interface is also available.
|
|
|
|
Procfs notes:
|
|
|
|
The available commands are:
|
|
|
|
echo up >/proc/acpi/ibm/brightness
|
|
echo down >/proc/acpi/ibm/brightness
|
|
echo 'level <level>' >/proc/acpi/ibm/brightness
|
|
|
|
Sysfs notes:
|
|
|
|
The interface is implemented through the backlight sysfs class, which is
|
|
poorly documented at this time.
|
|
|
|
Locate the thinkpad_screen device under /sys/class/backlight, and inside
|
|
it there will be the following attributes:
|
|
|
|
max_brightness:
|
|
Reads the maximum brightness the hardware can be set to.
|
|
The minimum is always zero.
|
|
|
|
actual_brightness:
|
|
Reads what brightness the screen is set to at this instant.
|
|
|
|
brightness:
|
|
Writes request the driver to change brightness to the
|
|
given value. Reads will tell you what brightness the
|
|
driver is trying to set the display to when "power" is set
|
|
to zero and the display has not been dimmed by a kernel
|
|
power management event.
|
|
|
|
power:
|
|
power management mode, where 0 is "display on", and 1 to 3
|
|
will dim the display backlight to brightness level 0
|
|
because thinkpad-acpi cannot really turn the backlight
|
|
off. Kernel power management events can temporarily
|
|
increase the current power management level, i.e. they can
|
|
dim the display.
|
|
|
|
|
|
WARNING:
|
|
|
|
Whatever you do, do NOT ever call thinkpad-acpi backlight-level change
|
|
interface and the ACPI-based backlight level change interface
|
|
(available on newer BIOSes, and driven by the Linux ACPI video driver)
|
|
at the same time. The two will interact in bad ways, do funny things,
|
|
and maybe reduce the life of the backlight lamps by needlessly kicking
|
|
its level up and down at every change.
|
|
|
|
|
|
Volume control (Console Audio control)
|
|
--------------------------------------
|
|
|
|
procfs: /proc/acpi/ibm/volume
|
|
ALSA: "ThinkPad Console Audio Control", default ID: "ThinkPadEC"
|
|
|
|
NOTE: by default, the volume control interface operates in read-only
|
|
mode, as it is supposed to be used for on-screen-display purposes.
|
|
The read/write mode can be enabled through the use of the
|
|
"volume_control=1" module parameter.
|
|
|
|
NOTE: distros are urged to not enable volume_control by default, this
|
|
should be done by the local admin only. The ThinkPad UI is for the
|
|
console audio control to be done through the volume keys only, and for
|
|
the desktop environment to just provide on-screen-display feedback.
|
|
Software volume control should be done only in the main AC97/HDA
|
|
mixer.
|
|
|
|
|
|
About the ThinkPad Console Audio control:
|
|
|
|
ThinkPads have a built-in amplifier and muting circuit that drives the
|
|
console headphone and speakers. This circuit is after the main AC97
|
|
or HDA mixer in the audio path, and under exclusive control of the
|
|
firmware.
|
|
|
|
ThinkPads have three special hotkeys to interact with the console
|
|
audio control: volume up, volume down and mute.
|
|
|
|
It is worth noting that the normal way the mute function works (on
|
|
ThinkPads that do not have a "mute LED") is:
|
|
|
|
1. Press mute to mute. It will *always* mute, you can press it as
|
|
many times as you want, and the sound will remain mute.
|
|
|
|
2. Press either volume key to unmute the ThinkPad (it will _not_
|
|
change the volume, it will just unmute).
|
|
|
|
This is a very superior design when compared to the cheap software-only
|
|
mute-toggle solution found on normal consumer laptops: you can be
|
|
absolutely sure the ThinkPad will not make noise if you press the mute
|
|
button, no matter the previous state.
|
|
|
|
The IBM ThinkPads, and the earlier Lenovo ThinkPads have variable-gain
|
|
amplifiers driving the speakers and headphone output, and the firmware
|
|
also handles volume control for the headphone and speakers on these
|
|
ThinkPads without any help from the operating system (this volume
|
|
control stage exists after the main AC97 or HDA mixer in the audio
|
|
path).
|
|
|
|
The newer Lenovo models only have firmware mute control, and depend on
|
|
the main HDA mixer to do volume control (which is done by the operating
|
|
system). In this case, the volume keys are filtered out for unmute
|
|
key press (there are some firmware bugs in this area) and delivered as
|
|
normal key presses to the operating system (thinkpad-acpi is not
|
|
involved).
|
|
|
|
|
|
The ThinkPad-ACPI volume control:
|
|
|
|
The preferred way to interact with the Console Audio control is the
|
|
ALSA interface.
|
|
|
|
The legacy procfs interface allows one to read the current state,
|
|
and if volume control is enabled, accepts the following commands:
|
|
|
|
echo up >/proc/acpi/ibm/volume
|
|
echo down >/proc/acpi/ibm/volume
|
|
echo mute >/proc/acpi/ibm/volume
|
|
echo unmute >/proc/acpi/ibm/volume
|
|
echo 'level <level>' >/proc/acpi/ibm/volume
|
|
|
|
The <level> number range is 0 to 14 although not all of them may be
|
|
distinct. To unmute the volume after the mute command, use either the
|
|
up or down command (the level command will not unmute the volume), or
|
|
the unmute command.
|
|
|
|
You can use the volume_capabilities parameter to tell the driver
|
|
whether your thinkpad has volume control or mute-only control:
|
|
volume_capabilities=1 for mixers with mute and volume control,
|
|
volume_capabilities=2 for mixers with only mute control.
|
|
|
|
If the driver misdetects the capabilities for your ThinkPad model,
|
|
please report this to ibm-acpi-devel@lists.sourceforge.net, so that we
|
|
can update the driver.
|
|
|
|
There are two strategies for volume control. To select which one
|
|
should be used, use the volume_mode module parameter: volume_mode=1
|
|
selects EC mode, and volume_mode=3 selects EC mode with NVRAM backing
|
|
(so that volume/mute changes are remembered across shutdown/reboot).
|
|
|
|
The driver will operate in volume_mode=3 by default. If that does not
|
|
work well on your ThinkPad model, please report this to
|
|
ibm-acpi-devel@lists.sourceforge.net.
|
|
|
|
The driver supports the standard ALSA module parameters. If the ALSA
|
|
mixer is disabled, the driver will disable all volume functionality.
|
|
|
|
|
|
Fan control and monitoring: fan speed, fan enable/disable
|
|
---------------------------------------------------------
|
|
|
|
procfs: /proc/acpi/ibm/fan
|
|
sysfs device attributes: (hwmon "thinkpad") fan1_input, pwm1,
|
|
pwm1_enable, fan2_input
|
|
sysfs hwmon driver attributes: fan_watchdog
|
|
|
|
NOTE NOTE NOTE: fan control operations are disabled by default for
|
|
safety reasons. To enable them, the module parameter "fan_control=1"
|
|
must be given to thinkpad-acpi.
|
|
|
|
This feature attempts to show the current fan speed, control mode and
|
|
other fan data that might be available. The speed is read directly
|
|
from the hardware registers of the embedded controller. This is known
|
|
to work on later R, T, X and Z series ThinkPads but may show a bogus
|
|
value on other models.
|
|
|
|
Some Lenovo ThinkPads support a secondary fan. This fan cannot be
|
|
controlled separately, it shares the main fan control.
|
|
|
|
Fan levels:
|
|
|
|
Most ThinkPad fans work in "levels" at the firmware interface. Level 0
|
|
stops the fan. The higher the level, the higher the fan speed, although
|
|
adjacent levels often map to the same fan speed. 7 is the highest
|
|
level, where the fan reaches the maximum recommended speed.
|
|
|
|
Level "auto" means the EC changes the fan level according to some
|
|
internal algorithm, usually based on readings from the thermal sensors.
|
|
|
|
There is also a "full-speed" level, also known as "disengaged" level.
|
|
In this level, the EC disables the speed-locked closed-loop fan control,
|
|
and drives the fan as fast as it can go, which might exceed hardware
|
|
limits, so use this level with caution.
|
|
|
|
The fan usually ramps up or down slowly from one speed to another, and
|
|
it is normal for the EC to take several seconds to react to fan
|
|
commands. The full-speed level may take up to two minutes to ramp up to
|
|
maximum speed, and in some ThinkPads, the tachometer readings go stale
|
|
while the EC is transitioning to the full-speed level.
|
|
|
|
WARNING WARNING WARNING: do not leave the fan disabled unless you are
|
|
monitoring all of the temperature sensor readings and you are ready to
|
|
enable it if necessary to avoid overheating.
|
|
|
|
An enabled fan in level "auto" may stop spinning if the EC decides the
|
|
ThinkPad is cool enough and doesn't need the extra airflow. This is
|
|
normal, and the EC will spin the fan up if the various thermal readings
|
|
rise too much.
|
|
|
|
On the X40, this seems to depend on the CPU and HDD temperatures.
|
|
Specifically, the fan is turned on when either the CPU temperature
|
|
climbs to 56 degrees or the HDD temperature climbs to 46 degrees. The
|
|
fan is turned off when the CPU temperature drops to 49 degrees and the
|
|
HDD temperature drops to 41 degrees. These thresholds cannot
|
|
currently be controlled.
|
|
|
|
The ThinkPad's ACPI DSDT code will reprogram the fan on its own when
|
|
certain conditions are met. It will override any fan programming done
|
|
through thinkpad-acpi.
|
|
|
|
The thinkpad-acpi kernel driver can be programmed to revert the fan
|
|
level to a safe setting if userspace does not issue one of the procfs
|
|
fan commands: "enable", "disable", "level" or "watchdog", or if there
|
|
are no writes to pwm1_enable (or to pwm1 *if and only if* pwm1_enable is
|
|
set to 1, manual mode) within a configurable amount of time of up to
|
|
120 seconds. This functionality is called fan safety watchdog.
|
|
|
|
Note that the watchdog timer stops after it enables the fan. It will be
|
|
rearmed again automatically (using the same interval) when one of the
|
|
above mentioned fan commands is received. The fan watchdog is,
|
|
therefore, not suitable to protect against fan mode changes made through
|
|
means other than the "enable", "disable", and "level" procfs fan
|
|
commands, or the hwmon fan control sysfs interface.
|
|
|
|
Procfs notes:
|
|
|
|
The fan may be enabled or disabled with the following commands:
|
|
|
|
echo enable >/proc/acpi/ibm/fan
|
|
echo disable >/proc/acpi/ibm/fan
|
|
|
|
Placing a fan on level 0 is the same as disabling it. Enabling a fan
|
|
will try to place it in a safe level if it is too slow or disabled.
|
|
|
|
The fan level can be controlled with the command:
|
|
|
|
echo 'level <level>' > /proc/acpi/ibm/fan
|
|
|
|
Where <level> is an integer from 0 to 7, or one of the words "auto" or
|
|
"full-speed" (without the quotes). Not all ThinkPads support the "auto"
|
|
and "full-speed" levels. The driver accepts "disengaged" as an alias for
|
|
"full-speed", and reports it as "disengaged" for backwards
|
|
compatibility.
|
|
|
|
On the X31 and X40 (and ONLY on those models), the fan speed can be
|
|
controlled to a certain degree. Once the fan is running, it can be
|
|
forced to run faster or slower with the following command:
|
|
|
|
echo 'speed <speed>' > /proc/acpi/ibm/fan
|
|
|
|
The sustainable range of fan speeds on the X40 appears to be from about
|
|
3700 to about 7350. Values outside this range either do not have any
|
|
effect or the fan speed eventually settles somewhere in that range. The
|
|
fan cannot be stopped or started with this command. This functionality
|
|
is incomplete, and not available through the sysfs interface.
|
|
|
|
To program the safety watchdog, use the "watchdog" command.
|
|
|
|
echo 'watchdog <interval in seconds>' > /proc/acpi/ibm/fan
|
|
|
|
If you want to disable the watchdog, use 0 as the interval.
|
|
|
|
Sysfs notes:
|
|
|
|
The sysfs interface follows the hwmon subsystem guidelines for the most
|
|
part, and the exception is the fan safety watchdog.
|
|
|
|
Writes to any of the sysfs attributes may return the EINVAL error if
|
|
that operation is not supported in a given ThinkPad or if the parameter
|
|
is out-of-bounds, and EPERM if it is forbidden. They may also return
|
|
EINTR (interrupted system call), and EIO (I/O error while trying to talk
|
|
to the firmware).
|
|
|
|
Features not yet implemented by the driver return ENOSYS.
|
|
|
|
hwmon device attribute pwm1_enable:
|
|
0: PWM offline (fan is set to full-speed mode)
|
|
1: Manual PWM control (use pwm1 to set fan level)
|
|
2: Hardware PWM control (EC "auto" mode)
|
|
3: reserved (Software PWM control, not implemented yet)
|
|
|
|
Modes 0 and 2 are not supported by all ThinkPads, and the
|
|
driver is not always able to detect this. If it does know a
|
|
mode is unsupported, it will return -EINVAL.
|
|
|
|
hwmon device attribute pwm1:
|
|
Fan level, scaled from the firmware values of 0-7 to the hwmon
|
|
scale of 0-255. 0 means fan stopped, 255 means highest normal
|
|
speed (level 7).
|
|
|
|
This attribute only commands the fan if pmw1_enable is set to 1
|
|
(manual PWM control).
|
|
|
|
hwmon device attribute fan1_input:
|
|
Fan tachometer reading, in RPM. May go stale on certain
|
|
ThinkPads while the EC transitions the PWM to offline mode,
|
|
which can take up to two minutes. May return rubbish on older
|
|
ThinkPads.
|
|
|
|
hwmon device attribute fan2_input:
|
|
Fan tachometer reading, in RPM, for the secondary fan.
|
|
Available only on some ThinkPads. If the secondary fan is
|
|
not installed, will always read 0.
|
|
|
|
hwmon driver attribute fan_watchdog:
|
|
Fan safety watchdog timer interval, in seconds. Minimum is
|
|
1 second, maximum is 120 seconds. 0 disables the watchdog.
|
|
|
|
To stop the fan: set pwm1 to zero, and pwm1_enable to 1.
|
|
|
|
To start the fan in a safe mode: set pwm1_enable to 2. If that fails
|
|
with EINVAL, try to set pwm1_enable to 1 and pwm1 to at least 128 (255
|
|
would be the safest choice, though).
|
|
|
|
|
|
WAN
|
|
---
|
|
|
|
procfs: /proc/acpi/ibm/wan
|
|
sysfs device attribute: wwan_enable (deprecated)
|
|
sysfs rfkill class: switch "tpacpi_wwan_sw"
|
|
|
|
This feature shows the presence and current state of the built-in
|
|
Wireless WAN device.
|
|
|
|
If the ThinkPad supports it, the WWAN state is stored in NVRAM,
|
|
so it is kept across reboots and power-off.
|
|
|
|
It was tested on a Lenovo ThinkPad X60. It should probably work on other
|
|
ThinkPad models which come with this module installed.
|
|
|
|
Procfs notes:
|
|
|
|
If the W-WAN card is installed, the following commands can be used:
|
|
|
|
echo enable > /proc/acpi/ibm/wan
|
|
echo disable > /proc/acpi/ibm/wan
|
|
|
|
Sysfs notes:
|
|
|
|
If the W-WAN card is installed, it can be enabled /
|
|
disabled through the "wwan_enable" thinkpad-acpi device
|
|
attribute, and its current status can also be queried.
|
|
|
|
enable:
|
|
0: disables WWAN card / WWAN card is disabled
|
|
1: enables WWAN card / WWAN card is enabled.
|
|
|
|
Note: this interface has been superseded by the generic rfkill
|
|
class. It has been deprecated, and it will be removed in year
|
|
2010.
|
|
|
|
rfkill controller switch "tpacpi_wwan_sw": refer to
|
|
Documentation/rfkill.txt for details.
|
|
|
|
|
|
EXPERIMENTAL: UWB
|
|
-----------------
|
|
|
|
This feature is considered EXPERIMENTAL because it has not been extensively
|
|
tested and validated in various ThinkPad models yet. The feature may not
|
|
work as expected. USE WITH CAUTION! To use this feature, you need to supply
|
|
the experimental=1 parameter when loading the module.
|
|
|
|
sysfs rfkill class: switch "tpacpi_uwb_sw"
|
|
|
|
This feature exports an rfkill controller for the UWB device, if one is
|
|
present and enabled in the BIOS.
|
|
|
|
Sysfs notes:
|
|
|
|
rfkill controller switch "tpacpi_uwb_sw": refer to
|
|
Documentation/rfkill.txt for details.
|
|
|
|
|
|
Multiple Commands, Module Parameters
|
|
------------------------------------
|
|
|
|
Multiple commands can be written to the proc files in one shot by
|
|
separating them with commas, for example:
|
|
|
|
echo enable,0xffff > /proc/acpi/ibm/hotkey
|
|
echo lcd_disable,crt_enable > /proc/acpi/ibm/video
|
|
|
|
Commands can also be specified when loading the thinkpad-acpi module,
|
|
for example:
|
|
|
|
modprobe thinkpad_acpi hotkey=enable,0xffff video=auto_disable
|
|
|
|
|
|
Enabling debugging output
|
|
-------------------------
|
|
|
|
The module takes a debug parameter which can be used to selectively
|
|
enable various classes of debugging output, for example:
|
|
|
|
modprobe thinkpad_acpi debug=0xffff
|
|
|
|
will enable all debugging output classes. It takes a bitmask, so
|
|
to enable more than one output class, just add their values.
|
|
|
|
Debug bitmask Description
|
|
0x8000 Disclose PID of userspace programs
|
|
accessing some functions of the driver
|
|
0x0001 Initialization and probing
|
|
0x0002 Removal
|
|
0x0004 RF Transmitter control (RFKILL)
|
|
(bluetooth, WWAN, UWB...)
|
|
0x0008 HKEY event interface, hotkeys
|
|
0x0010 Fan control
|
|
0x0020 Backlight brightness
|
|
0x0040 Audio mixer/volume control
|
|
|
|
There is also a kernel build option to enable more debugging
|
|
information, which may be necessary to debug driver problems.
|
|
|
|
The level of debugging information output by the driver can be changed
|
|
at runtime through sysfs, using the driver attribute debug_level. The
|
|
attribute takes the same bitmask as the debug module parameter above.
|
|
|
|
|
|
Force loading of module
|
|
-----------------------
|
|
|
|
If thinkpad-acpi refuses to detect your ThinkPad, you can try to specify
|
|
the module parameter force_load=1. Regardless of whether this works or
|
|
not, please contact ibm-acpi-devel@lists.sourceforge.net with a report.
|
|
|
|
|
|
Sysfs interface changelog:
|
|
|
|
0x000100: Initial sysfs support, as a single platform driver and
|
|
device.
|
|
0x000200: Hot key support for 32 hot keys, and radio slider switch
|
|
support.
|
|
0x010000: Hot keys are now handled by default over the input
|
|
layer, the radio switch generates input event EV_RADIO,
|
|
and the driver enables hot key handling by default in
|
|
the firmware.
|
|
|
|
0x020000: ABI fix: added a separate hwmon platform device and
|
|
driver, which must be located by name (thinkpad)
|
|
and the hwmon class for libsensors4 (lm-sensors 3)
|
|
compatibility. Moved all hwmon attributes to this
|
|
new platform device.
|
|
|
|
0x020100: Marker for thinkpad-acpi with hot key NVRAM polling
|
|
support. If you must, use it to know you should not
|
|
start a userspace NVRAM poller (allows to detect when
|
|
NVRAM is compiled out by the user because it is
|
|
unneeded/undesired in the first place).
|
|
0x020101: Marker for thinkpad-acpi with hot key NVRAM polling
|
|
and proper hotkey_mask semantics (version 8 of the
|
|
NVRAM polling patch). Some development snapshots of
|
|
0.18 had an earlier version that did strange things
|
|
to hotkey_mask.
|
|
|
|
0x020200: Add poll()/select() support to the following attributes:
|
|
hotkey_radio_sw, wakeup_hotunplug_complete, wakeup_reason
|
|
|
|
0x020300: hotkey enable/disable support removed, attributes
|
|
hotkey_bios_enabled and hotkey_enable deprecated and
|
|
marked for removal.
|
|
|
|
0x020400: Marker for 16 LEDs support. Also, LEDs that are known
|
|
to not exist in a given model are not registered with
|
|
the LED sysfs class anymore.
|
|
|
|
0x020500: Updated hotkey driver, hotkey_mask is always available
|
|
and it is always able to disable hot keys. Very old
|
|
thinkpads are properly supported. hotkey_bios_mask
|
|
is deprecated and marked for removal.
|
|
|
|
0x020600: Marker for backlight change event support.
|
|
|
|
0x020700: Support for mute-only mixers.
|
|
Volume control in read-only mode by default.
|
|
Marker for ALSA mixer support.
|