729 lines
29 KiB
Plaintext
729 lines
29 KiB
Plaintext
IBM ThinkPad ACPI Extras Driver
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Version 0.12
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17 August 2005
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Borislav Deianov <borislav@users.sf.net>
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http://ibm-acpi.sf.net/
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This is a Linux ACPI driver for the IBM ThinkPad laptops. It supports
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various features of these laptops which are accessible through the
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ACPI framework but not otherwise supported by the generic Linux ACPI
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drivers.
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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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- limited docking and undocking
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- UltraBay eject
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- CMOS 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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- Experimental: fan speed, fan enable/disable
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- Experimental: WAN 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 DSDT, from /proc/acpi/dsdt
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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, simply enable the CONFIG_ACPI_IBM option (Power Management /
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ACPI / IBM ThinkPad Laptop Extras).
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Features
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--------
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The driver creates the /proc/acpi/ibm directory. There is a file under
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that directory for each feature described below. Note that while the
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driver is still in the alpha stage, the exact proc file format and
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commands supported by the various features is guaranteed to change
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frequently.
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Driver version -- /proc/acpi/ibm/driver
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---------------------------------------
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The driver name and version. No commands can be written to this file.
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Hot keys -- /proc/acpi/ibm/hotkey
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---------------------------------
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Without this driver, only the Fn-F4 key (sleep button) generates an
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ACPI event. With the driver loaded, the hotkey feature enabled and the
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mask set (see below), the various hot keys generate ACPI events in the
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following format:
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ibm/hotkey HKEY 00000080 0000xxxx
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The last four digits vary depending on the key combination pressed.
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All labeled Fn-Fx key combinations generate distinct events. In
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addition, the lid microswitch and some docking station buttons may
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also generate such events.
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The following commands can be written to this file:
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echo enable > /proc/acpi/ibm/hotkey -- enable the hot keys feature
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echo disable > /proc/acpi/ibm/hotkey -- disable the hot keys feature
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echo 0xffff > /proc/acpi/ibm/hotkey -- enable all possible hot keys
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echo 0x0000 > /proc/acpi/ibm/hotkey -- disable all possible hot keys
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... any other 4-hex-digit mask ...
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echo reset > /proc/acpi/ibm/hotkey -- restore the original mask
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The bit mask allows some control over which hot keys generate ACPI
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events. Not all bits in the mask can be modified. Not all bits that
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can be modified do anything. Not all hot keys can be individually
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controlled by the mask. Most recent ThinkPad models honor the
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following bits (assuming the hot keys feature has been enabled):
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key bit behavior when set behavior when unset
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Fn-F3 always generates ACPI event
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Fn-F4 always generates ACPI event
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Fn-F5 0010 generate ACPI event enable/disable Bluetooth
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Fn-F7 0040 generate ACPI event switch LCD and external display
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Fn-F8 0080 generate ACPI event expand screen or none
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Fn-F9 0100 generate ACPI event none
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Fn-F12 always generates ACPI event
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Some models do not support all of the above. For example, the T30 does
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not support Fn-F5 and Fn-F9. Other models do not support the mask at
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all. On those models, hot keys cannot be controlled individually.
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Note that enabling ACPI events for some keys prevents their default
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behavior. For example, if events for Fn-F5 are enabled, that key will
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no longer enable/disable Bluetooth by itself. This can still be done
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from an acpid handler for the ibm/hotkey event.
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Note also that not all Fn key combinations are supported through
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ACPI. For example, on the X40, the brightness, volume and "Access IBM"
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buttons do not generate ACPI events even with this driver. They *can*
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be used through the "ThinkPad Buttons" utility, see
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http://www.nongnu.org/tpb/
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Bluetooth -- /proc/acpi/ibm/bluetooth
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-------------------------------------
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This feature shows the presence and current state of a Bluetooth
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device. If Bluetooth is installed, the following commands can be used:
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echo enable > /proc/acpi/ibm/bluetooth
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echo disable > /proc/acpi/ibm/bluetooth
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Video output control -- /proc/acpi/ibm/video
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--------------------------------------------
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This feature allows control over the devices used for video output -
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LCD, CRT or DVI (if available). The following commands are available:
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echo lcd_enable > /proc/acpi/ibm/video
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echo lcd_disable > /proc/acpi/ibm/video
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echo crt_enable > /proc/acpi/ibm/video
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echo crt_disable > /proc/acpi/ibm/video
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echo dvi_enable > /proc/acpi/ibm/video
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echo dvi_disable > /proc/acpi/ibm/video
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echo auto_enable > /proc/acpi/ibm/video
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echo auto_disable > /proc/acpi/ibm/video
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echo expand_toggle > /proc/acpi/ibm/video
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echo video_switch > /proc/acpi/ibm/video
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Each video output device can be enabled or disabled individually.
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Reading /proc/acpi/ibm/video shows the status of each device.
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Automatic video switching can be enabled or disabled. When automatic
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video switching is enabled, certain events (e.g. opening the lid,
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docking or undocking) cause the video output device to change
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automatically. While this can be useful, it also causes flickering
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and, on the X40, video corruption. By disabling automatic switching,
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the flickering or video corruption can be avoided.
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The video_switch command cycles through the available video outputs
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(it simulates the behavior of Fn-F7).
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Video expansion can be toggled through this feature. This controls
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whether the display is expanded to fill the entire LCD screen when a
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mode with less than full resolution is used. Note that the current
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video expansion status cannot be determined through this feature.
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Note that on many models (particularly those using Radeon graphics
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chips) the X driver configures the video card in a way which prevents
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Fn-F7 from working. This also disables the video output switching
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features of this driver, as it uses the same ACPI methods as
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Fn-F7. Video switching on the console should still work.
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UPDATE: There's now a patch for the X.org Radeon driver which
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addresses this issue. Some people are reporting success with the patch
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while others are still having problems. For more information:
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https://bugs.freedesktop.org/show_bug.cgi?id=2000
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ThinkLight control -- /proc/acpi/ibm/light
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------------------------------------------
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The current status of the ThinkLight can be found in this file. A few
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models which do not make the status available will show it as
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"unknown". The available commands are:
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echo on > /proc/acpi/ibm/light
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echo off > /proc/acpi/ibm/light
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Docking / undocking -- /proc/acpi/ibm/dock
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------------------------------------------
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Docking and undocking (e.g. with the X4 UltraBase) requires some
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actions to be taken by the operating system to safely make or break
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the electrical connections with the dock.
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The docking feature of this driver generates the following ACPI events:
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ibm/dock GDCK 00000003 00000001 -- eject request
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ibm/dock GDCK 00000003 00000002 -- undocked
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ibm/dock GDCK 00000000 00000003 -- docked
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NOTE: These events will only be generated if the laptop was docked
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when originally booted. This is due to the current lack of support for
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hot plugging of devices in the Linux ACPI framework. If the laptop was
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booted while not in the dock, the following message is shown in the
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logs:
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Mar 17 01:42:34 aero kernel: ibm_acpi: dock device not present
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In this case, no dock-related events are generated but the dock and
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undock commands described below still work. They can be executed
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manually or triggered by Fn key combinations (see the example acpid
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configuration files included in the driver tarball package available
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on the web site).
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When the eject request button on the dock is pressed, the first event
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above is generated. The handler for this event should issue the
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following command:
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echo undock > /proc/acpi/ibm/dock
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After the LED on the dock goes off, it is safe to eject the laptop.
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Note: if you pressed this key by mistake, go ahead and eject the
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laptop, then dock it back in. Otherwise, the dock may not function as
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expected.
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When the laptop is docked, the third event above is generated. The
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handler for this event should issue the following command to fully
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enable the dock:
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echo dock > /proc/acpi/ibm/dock
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The contents of the /proc/acpi/ibm/dock file shows the current status
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of the dock, as provided by the ACPI framework.
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The docking support in this driver does not take care of enabling or
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disabling any other devices you may have attached to the dock. For
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example, a CD drive plugged into the UltraBase needs to be disabled or
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enabled separately. See the provided example acpid configuration files
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for how this can be accomplished.
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There is no support yet for PCI devices that may be attached to a
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docking station, e.g. in the ThinkPad Dock II. The driver currently
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does not recognize, enable or disable such devices. This means that
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the only docking stations currently supported are the X-series
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UltraBase docks and "dumb" port replicators like the Mini Dock (the
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latter don't need any ACPI support, actually).
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UltraBay eject -- /proc/acpi/ibm/bay
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------------------------------------
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Inserting or ejecting an UltraBay device requires some actions to be
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taken by the operating system to safely make or break the electrical
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connections with the device.
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This feature generates the following ACPI events:
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ibm/bay MSTR 00000003 00000000 -- eject request
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ibm/bay MSTR 00000001 00000000 -- eject lever inserted
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NOTE: These events will only be generated if the UltraBay was present
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when the laptop was originally booted (on the X series, the UltraBay
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is in the dock, so it may not be present if the laptop was undocked).
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This is due to the current lack of support for hot plugging of devices
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in the Linux ACPI framework. If the laptop was booted without the
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UltraBay, the following message is shown in the logs:
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Mar 17 01:42:34 aero kernel: ibm_acpi: bay device not present
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In this case, no bay-related events are generated but the eject
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command described below still works. It can be executed manually or
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triggered by a hot key combination.
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Sliding the eject lever generates the first event shown above. The
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handler for this event should take whatever actions are necessary to
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shut down the device in the UltraBay (e.g. call idectl), then issue
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the following command:
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echo eject > /proc/acpi/ibm/bay
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After the LED on the UltraBay goes off, it is safe to pull out the
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device.
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When the eject lever is inserted, the second event above is
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generated. The handler for this event should take whatever actions are
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necessary to enable the UltraBay device (e.g. call idectl).
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The contents of the /proc/acpi/ibm/bay file shows the current status
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of the UltraBay, as provided by the ACPI framework.
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EXPERIMENTAL warm eject support on the 600e/x, A22p and A3x (To use
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this feature, you need to supply the experimental=1 parameter when
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loading the module):
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These models do not have a button near the UltraBay device to request
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a hot eject but rather require the laptop to be put to sleep
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(suspend-to-ram) before the bay device is ejected or inserted).
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The sequence of steps to eject the device is as follows:
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echo eject > /proc/acpi/ibm/bay
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put the ThinkPad to sleep
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remove the drive
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resume from sleep
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cat /proc/acpi/ibm/bay should show that the drive was removed
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On the A3x, both the UltraBay 2000 and UltraBay Plus devices are
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supported. Use "eject2" instead of "eject" for the second bay.
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Note: the UltraBay eject support on the 600e/x, A22p and A3x is
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EXPERIMENTAL and may not work as expected. USE WITH CAUTION!
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CMOS control -- /proc/acpi/ibm/cmos
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-----------------------------------
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This feature is used internally by the ACPI firmware to control the
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ThinkLight on most newer ThinkPad models. It may also control LCD
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brightness, sounds volume and more, but only on some models.
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The commands are non-negative integer numbers:
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echo 0 >/proc/acpi/ibm/cmos
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echo 1 >/proc/acpi/ibm/cmos
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echo 2 >/proc/acpi/ibm/cmos
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...
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The range of valid numbers is 0 to 21, but not all have an effect and
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the behavior varies from model to model. Here is the behavior on the
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X40 (tpb is the ThinkPad Buttons utility):
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0 - no effect but tpb reports "Volume down"
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1 - no effect but tpb reports "Volume up"
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2 - no effect but tpb reports "Mute on"
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3 - simulate pressing the "Access IBM" button
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4 - LCD brightness up
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5 - LCD brightness down
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11 - toggle screen expansion
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12 - ThinkLight on
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13 - ThinkLight off
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14 - no effect but tpb reports ThinkLight status change
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LED control -- /proc/acpi/ibm/led
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---------------------------------
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Some of the LED indicators can be controlled through this feature. The
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available commands are:
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echo '<led number> on' >/proc/acpi/ibm/led
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echo '<led number> off' >/proc/acpi/ibm/led
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echo '<led number> blink' >/proc/acpi/ibm/led
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The <led number> range is 0 to 7. The set of LEDs that can be
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controlled varies from model to model. Here is the mapping on the X40:
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0 - power
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1 - battery (orange)
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2 - battery (green)
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3 - UltraBase
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4 - UltraBay
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7 - standby
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All of the above can be turned on and off and can be made to blink.
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ACPI sounds -- /proc/acpi/ibm/beep
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----------------------------------
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The BEEP method is used internally by the ACPI firmware to provide
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audible alerts in various situations. This feature allows the same
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sounds to be triggered manually.
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The commands are non-negative integer numbers:
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echo <number> >/proc/acpi/ibm/beep
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The valid <number> range is 0 to 17. Not all numbers trigger sounds
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and the sounds vary from model to model. Here is the behavior on the
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X40:
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0 - stop a sound in progress (but use 17 to stop 16)
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2 - two beeps, pause, third beep ("low battery")
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3 - single beep
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4 - high, followed by low-pitched beep ("unable")
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5 - single beep
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6 - very high, followed by high-pitched beep ("AC/DC")
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7 - high-pitched beep
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9 - three short beeps
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10 - very long beep
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12 - low-pitched beep
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15 - three high-pitched beeps repeating constantly, stop with 0
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16 - one medium-pitched beep repeating constantly, stop with 17
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17 - stop 16
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Temperature sensors -- /proc/acpi/ibm/thermal
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---------------------------------------------
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Most ThinkPads include six or more separate temperature sensors but
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only expose the CPU temperature through the standard ACPI methods.
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This feature shows readings from up to eight different sensors on older
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ThinkPads, and it has experimental support for up to sixteen different
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sensors on newer ThinkPads. Readings from sensors that are not available
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return -128.
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No commands can be written to this file.
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EXPERIMENTAL: The 16-sensors feature is marked EXPERIMENTAL because the
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implementation directly accesses hardware registers and may not work as
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expected. USE WITH CAUTION! To use this feature, you need to supply the
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experimental=1 parameter when loading the module. When EXPERIMENTAL
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mode is enabled, reading the first 8 sensors on newer ThinkPads will
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also use an new experimental thermal sensor access mode.
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For example, on the X40, a typical output may be:
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temperatures: 42 42 45 41 36 -128 33 -128
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EXPERIMENTAL: On the T43/p, a typical output may be:
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temperatures: 48 48 36 52 38 -128 31 -128 48 52 48 -128 -128 -128 -128 -128
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The mapping of thermal sensors to physical locations varies depending on
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system-board model (and thus, on ThinkPad model).
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http://thinkwiki.org/wiki/Thermal_Sensors is a public wiki page that
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tries to track down these locations for various models.
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Most (newer?) models seem to follow this pattern:
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1: CPU
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2: (depends on model)
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3: (depends on model)
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4: GPU
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5: Main battery: main sensor
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6: Bay battery: main sensor
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7: Main battery: secondary sensor
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8: Bay battery: secondary sensor
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9-15: (depends on model)
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For the R51 (source: Thomas Gruber):
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2: Mini-PCI
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3: Internal HDD
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For the T43, T43/p (source: Shmidoax/Thinkwiki.org)
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http://thinkwiki.org/wiki/Thermal_Sensors#ThinkPad_T43.2C_T43p
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2: System board, left side (near PCMCIA slot), reported as HDAPS temp
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3: PCMCIA slot
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9: MCH (northbridge) to DRAM Bus
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10: ICH (southbridge), under Mini-PCI card, under touchpad
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11: Power regulator, underside of system board, below F2 key
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The A31 has a very atypical layout for the thermal sensors
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(source: Milos Popovic, http://thinkwiki.org/wiki/Thermal_Sensors#ThinkPad_A31)
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1: CPU
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2: Main Battery: main sensor
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3: Power Converter
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4: Bay Battery: main sensor
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5: MCH (northbridge)
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6: PCMCIA/ambient
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7: Main Battery: secondary sensor
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8: Bay Battery: secondary sensor
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EXPERIMENTAL: Embedded controller register dump -- /proc/acpi/ibm/ecdump
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------------------------------------------------------------------------
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This feature is marked EXPERIMENTAL because the implementation
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directly accesses hardware registers and may not work as expected. USE
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WITH CAUTION! To use this feature, you need to supply the
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experimental=1 parameter when loading the module.
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This feature dumps the values of 256 embedded controller
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registers. Values which have changed since the last time the registers
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were dumped are marked with a star:
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[root@x40 ibm-acpi]# cat /proc/acpi/ibm/ecdump
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EC +00 +01 +02 +03 +04 +05 +06 +07 +08 +09 +0a +0b +0c +0d +0e +0f
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EC 0x00: a7 47 87 01 fe 96 00 08 01 00 cb 00 00 00 40 00
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EC 0x10: 00 00 ff ff f4 3c 87 09 01 ff 42 01 ff ff 0d 00
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EC 0x20: 00 00 00 00 00 00 00 00 00 00 00 03 43 00 00 80
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EC 0x30: 01 07 1a 00 30 04 00 00 *85 00 00 10 00 50 00 00
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EC 0x40: 00 00 00 00 00 00 14 01 00 04 00 00 00 00 00 00
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EC 0x50: 00 c0 02 0d 00 01 01 02 02 03 03 03 03 *bc *02 *bc
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EC 0x60: *02 *bc *02 00 00 00 00 00 00 00 00 00 00 00 00 00
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EC 0x70: 00 00 00 00 00 12 30 40 *24 *26 *2c *27 *20 80 *1f 80
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EC 0x80: 00 00 00 06 *37 *0e 03 00 00 00 0e 07 00 00 00 00
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EC 0x90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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EC 0xa0: *ff 09 ff 09 ff ff *64 00 *00 *00 *a2 41 *ff *ff *e0 00
|
|
EC 0xb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
|
|
EC 0xc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
|
|
EC 0xd0: 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
|
|
EC 0xe0: 00 00 00 00 00 00 00 00 11 20 49 04 24 06 55 03
|
|
EC 0xf0: 31 55 48 54 35 38 57 57 08 2f 45 73 07 65 6c 1a
|
|
|
|
This feature can be used 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
|
|
- run 'cat /proc/acpi/ibm/ecdump' several times, once per second or so
|
|
|
|
The first step makes sure various charging-related values don't
|
|
vary. The second ensures that the fan-related values do vary, since
|
|
the fan speed fluctuates a bit. The third will (hopefully) mark the
|
|
fan register with a star:
|
|
|
|
[root@x40 ibm-acpi]# cat /proc/acpi/ibm/ecdump
|
|
EC +00 +01 +02 +03 +04 +05 +06 +07 +08 +09 +0a +0b +0c +0d +0e +0f
|
|
EC 0x00: a7 47 87 01 fe 96 00 08 01 00 cb 00 00 00 40 00
|
|
EC 0x10: 00 00 ff ff f4 3c 87 09 01 ff 42 01 ff ff 0d 00
|
|
EC 0x20: 00 00 00 00 00 00 00 00 00 00 00 03 43 00 00 80
|
|
EC 0x30: 01 07 1a 00 30 04 00 00 85 00 00 10 00 50 00 00
|
|
EC 0x40: 00 00 00 00 00 00 14 01 00 04 00 00 00 00 00 00
|
|
EC 0x50: 00 c0 02 0d 00 01 01 02 02 03 03 03 03 bc 02 bc
|
|
EC 0x60: 02 bc 02 00 00 00 00 00 00 00 00 00 00 00 00 00
|
|
EC 0x70: 00 00 00 00 00 12 30 40 24 27 2c 27 21 80 1f 80
|
|
EC 0x80: 00 00 00 06 *be 0d 03 00 00 00 0e 07 00 00 00 00
|
|
EC 0x90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
|
|
EC 0xa0: ff 09 ff 09 ff ff 64 00 00 00 a2 41 ff ff e0 00
|
|
EC 0xb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
|
|
EC 0xc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
|
|
EC 0xd0: 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
|
|
EC 0xe0: 00 00 00 00 00 00 00 00 11 20 49 04 24 06 55 03
|
|
EC 0xf0: 31 55 48 54 35 38 57 57 08 2f 45 73 07 65 6c 1a
|
|
|
|
Another set of values that varies often is the temperature
|
|
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 -- /proc/acpi/ibm/brightness
|
|
---------------------------------------------------
|
|
|
|
This feature allows software control of the LCD brightness on ThinkPad
|
|
models which don't have a hardware brightness slider. The available
|
|
commands are:
|
|
|
|
echo up >/proc/acpi/ibm/brightness
|
|
echo down >/proc/acpi/ibm/brightness
|
|
echo 'level <level>' >/proc/acpi/ibm/brightness
|
|
|
|
The <level> number range is 0 to 7, although not all of them may be
|
|
distinct. The current brightness level is shown in the file.
|
|
|
|
Volume control -- /proc/acpi/ibm/volume
|
|
---------------------------------------
|
|
|
|
This feature allows volume control on ThinkPad models which don't have
|
|
a hardware volume knob. The available commands are:
|
|
|
|
echo up >/proc/acpi/ibm/volume
|
|
echo down >/proc/acpi/ibm/volume
|
|
echo mute >/proc/acpi/ibm/volume
|
|
echo 'level <level>' >/proc/acpi/ibm/volume
|
|
|
|
The <level> number range is 0 to 15 although not all of them may be
|
|
distinct. The unmute the volume after the mute command, use either the
|
|
up or down command (the level command will not unmute the volume).
|
|
The current volume level and mute state is shown in the file.
|
|
|
|
EXPERIMENTAL: fan speed, fan enable/disable -- /proc/acpi/ibm/fan
|
|
-----------------------------------------------------------------
|
|
|
|
This feature is marked EXPERIMENTAL because the implementation
|
|
directly accesses hardware registers and may not work as expected. USE
|
|
WITH CAUTION! To use this feature, you need to supply the
|
|
experimental=1 parameter when loading the module.
|
|
|
|
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 and X series ThinkPads but may show a bogus
|
|
value on other models.
|
|
|
|
Most ThinkPad fans work in "levels". 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. Level "disengaged" means 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 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.
|
|
|
|
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 varios 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 fan level can be controlled with the command:
|
|
|
|
echo 'level <level>' > /proc/acpi/ibm/thermal
|
|
|
|
Where <level> is an integer from 0 to 7, or one of the words "auto"
|
|
or "disengaged" (without the quotes). Not all ThinkPads support the
|
|
"auto" and "disengaged" levels.
|
|
|
|
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/thermal
|
|
|
|
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.
|
|
|
|
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 ibm-acpi.
|
|
|
|
EXPERIMENTAL: WAN -- /proc/acpi/ibm/wan
|
|
---------------------------------------
|
|
|
|
This feature is marked EXPERIMENTAL because the implementation
|
|
directly accesses hardware registers and may not work as expected. USE
|
|
WITH CAUTION! To use this feature, you need to supply the
|
|
experimental=1 parameter when loading the module.
|
|
|
|
This feature shows the presence and current state of a WAN (Sierra
|
|
Wireless EV-DO) device. If WAN is installed, the following commands can
|
|
be used:
|
|
|
|
echo enable > /proc/acpi/ibm/wan
|
|
echo disable > /proc/acpi/ibm/wan
|
|
|
|
It was tested on a Lenovo Thinkpad X60. It should probably work on other
|
|
Thinkpad models which come with this module installed.
|
|
|
|
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 ibm_acpi module, for
|
|
example:
|
|
|
|
modprobe ibm_acpi hotkey=enable,0xffff video=auto_disable
|
|
|
|
The ibm-acpi kernel driver can be programmed to revert the fan level
|
|
to a safe setting if userspace does not issue one of the fan commands:
|
|
"enable", "disable", "level" or "watchdog" within a configurable
|
|
ammount of time. To do this, use the "watchdog" command.
|
|
|
|
echo 'watchdog <interval>' > /proc/acpi/ibm/fan
|
|
|
|
Interval is the ammount of time in seconds to wait for one of the
|
|
above mentioned fan commands before reseting the fan level to a safe
|
|
one. If set to zero, the watchdog is disabled (default). When the
|
|
watchdog timer runs out, it does the exact equivalent of the "enable"
|
|
fan command.
|
|
|
|
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" fan
|
|
commands.
|
|
|
|
|
|
Example Configuration
|
|
---------------------
|
|
|
|
The ACPI support in the kernel is intended to be used in conjunction
|
|
with a user-space daemon, acpid. The configuration files for this
|
|
daemon control what actions are taken in response to various ACPI
|
|
events. An example set of configuration files are included in the
|
|
config/ directory of the tarball package available on the web
|
|
site. Note that these are provided for illustration purposes only and
|
|
may need to be adapted to your particular setup.
|
|
|
|
The following utility scripts are used by the example action
|
|
scripts (included with ibm-acpi for completeness):
|
|
|
|
/usr/local/sbin/idectl -- from the hdparm source distribution,
|
|
see http://www.ibiblio.org/pub/Linux/system/hardware
|
|
/usr/local/sbin/laptop_mode -- from the Linux kernel source
|
|
distribution, see Documentation/laptop-mode.txt
|
|
/sbin/service -- comes with Redhat/Fedora distributions
|
|
/usr/sbin/hibernate -- from the Software Suspend 2 distribution,
|
|
see http://softwaresuspend.berlios.de/
|
|
|
|
Toan T Nguyen <ntt@physics.ucla.edu> notes that Suse uses the
|
|
powersave program to suspend ('powersave --suspend-to-ram') or
|
|
hibernate ('powersave --suspend-to-disk'). This means that the
|
|
hibernate script is not needed on that distribution.
|
|
|
|
Henrik Brix Andersen <brix@gentoo.org> has written a Gentoo ACPI event
|
|
handler script for the X31. You can get the latest version from
|
|
http://dev.gentoo.org/~brix/files/x31.sh
|
|
|
|
David Schweikert <dws@ee.eth.ch> has written an alternative blank.sh
|
|
script which works on Debian systems. This scripts has now been
|
|
extended to also work on Fedora systems and included as the default
|
|
blank.sh in the distribution.
|