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374
Documentation/ibm-acpi.txt
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@ -1,16 +1,16 @@
IBM ThinkPad ACPI Extras Driver
Version 0.8
8 November 2004
Version 0.12
17 August 2005
Borislav Deianov <borislav@users.sf.net>
http://ibm-acpi.sf.net/
This is a Linux ACPI driver for the IBM ThinkPad laptops. It aims to
support various features of these laptops which are accessible through
the ACPI framework but not otherwise supported by the generic Linux
ACPI drivers.
This is a Linux ACPI driver for the IBM ThinkPad laptops. It supports
various features of these laptops which are accessible through the
ACPI framework but not otherwise supported by the generic Linux ACPI
drivers.
Status
@ -25,9 +25,14 @@ detailed description):
- ThinkLight on and off
- limited docking and undocking
- UltraBay eject
- Experimental: CMOS control
- Experimental: LED control
- Experimental: ACPI sounds
- CMOS control
- LED control
- ACPI sounds
- temperature sensors
- Experimental: embedded controller register dump
- Experimental: LCD brightness control
- Experimental: volume control
- Experimental: fan speed, fan enable/disable
A compatibility table by model and feature is maintained on the web
site, http://ibm-acpi.sf.net/. I appreciate any success or failure
@ -91,12 +96,12 @@ driver is still in the alpha stage, the exact proc file format and
commands supported by the various features is guaranteed to change
frequently.
Driver Version -- /proc/acpi/ibm/driver
--------------------------------------
Driver version -- /proc/acpi/ibm/driver
---------------------------------------
The driver name and version. No commands can be written to this file.
Hot Keys -- /proc/acpi/ibm/hotkey
Hot keys -- /proc/acpi/ibm/hotkey
---------------------------------
Without this driver, only the Fn-F4 key (sleep button) generates an
@ -188,7 +193,7 @@ 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 sumulates the behavior of Fn-F7).
(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
@ -201,6 +206,12 @@ 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: There's now a patch for the X.org Radeon driver which
addresses this issue. Some people are reporting success with the patch
while others are still having problems. For more information:
https://bugs.freedesktop.org/show_bug.cgi?id=2000
ThinkLight control -- /proc/acpi/ibm/light
------------------------------------------
@ -211,7 +222,7 @@ models which do not make the status available will show it as
echo on > /proc/acpi/ibm/light
echo off > /proc/acpi/ibm/light
Docking / Undocking -- /proc/acpi/ibm/dock
Docking / undocking -- /proc/acpi/ibm/dock
------------------------------------------
Docking and undocking (e.g. with the X4 UltraBase) requires some
@ -228,11 +239,15 @@ NOTE: These events will only be generated if the laptop was docked
when originally booted. This is due to the current lack of support for
hot plugging of devices in the Linux ACPI framework. If the laptop was
booted while not in the dock, the following message is shown in the
logs: "ibm_acpi: dock device not present". No dock-related events are
generated but the dock and undock commands described below still
work. They can be executed manually or triggered by Fn key
combinations (see the example acpid configuration files included in
the driver tarball package available on the web site).
logs:
Mar 17 01:42:34 aero kernel: ibm_acpi: dock device not present
In this case, no dock-related events are generated but the dock and
undock commands described below still work. They can be executed
manually or triggered by Fn key combinations (see the example acpid
configuration files included in the driver tarball package available
on the web site).
When the eject request button on the dock is pressed, the first event
above is generated. The handler for this event should issue the
@ -267,7 +282,7 @@ the only docking stations currently supported are the X-series
UltraBase docks and "dumb" port replicators like the Mini Dock (the
latter don't need any ACPI support, actually).
UltraBay Eject -- /proc/acpi/ibm/bay
UltraBay eject -- /proc/acpi/ibm/bay
------------------------------------
Inserting or ejecting an UltraBay device requires some actions to be
@ -284,8 +299,11 @@ when the laptop was originally booted (on the X series, the UltraBay
is in the dock, so it may not be present if the laptop was undocked).
This is due to the current lack of support for hot plugging of devices
in the Linux ACPI framework. If the laptop was booted without the
UltraBay, the following message is shown in the logs: "ibm_acpi: bay
device not present". No bay-related events are generated but the eject
UltraBay, the following message is shown in the logs:
Mar 17 01:42:34 aero kernel: ibm_acpi: bay device not present
In this case, no bay-related events are generated but the eject
command described below still works. It can be executed manually or
triggered by a hot key combination.
@ -306,22 +324,33 @@ necessary to enable the UltraBay device (e.g. call idectl).
The contents of the /proc/acpi/ibm/bay file shows the current status
of the UltraBay, as provided by the ACPI framework.
Experimental Features
---------------------
EXPERIMENTAL warm eject support on the 600e/x, A22p and A3x (To use
this feature, you need to supply the experimental=1 parameter when
loading the module):
The following features are marked experimental because using them
involves guessing the correct values of some parameters. Guessing
incorrectly may have undesirable effects like crashing your
ThinkPad. USE THESE WITH CAUTION! To activate them, you'll need to
supply the experimental=1 parameter when loading the module.
These models do not have a button near the UltraBay device to request
a hot eject but rather require the laptop to be put to sleep
(suspend-to-ram) before the bay device is ejected or inserted).
The sequence of steps to eject the device is as follows:
Experimental: CMOS control - /proc/acpi/ibm/cmos
------------------------------------------------
echo eject > /proc/acpi/ibm/bay
put the ThinkPad to sleep
remove the drive
resume from sleep
cat /proc/acpi/ibm/bay should show that the drive was removed
On the A3x, both the UltraBay 2000 and UltraBay Plus devices are
supported. Use "eject2" instead of "eject" for the second bay.
Note: the UltraBay eject support on the 600e/x, A22p and A3x is
EXPERIMENTAL and may not work as expected. USE WITH CAUTION!
CMOS control -- /proc/acpi/ibm/cmos
-----------------------------------
This feature is used internally by the ACPI firmware to control the
ThinkLight on most newer ThinkPad models. It appears that it can also
control LCD brightness, sounds volume and more, but only on some
models.
ThinkLight on most newer ThinkPad models. It may also control LCD
brightness, sounds volume and more, but only on some models.
The commands are non-negative integer numbers:
@ -330,10 +359,9 @@ The commands are non-negative integer numbers:
echo 2 >/proc/acpi/ibm/cmos
...
The range of numbers which are used internally by various models is 0
to 21, but it's possible that numbers outside this range have
interesting behavior. Here is the behavior on the X40 (tpb is the
ThinkPad Buttons utility):
The range of valid 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 - no effect but tpb reports "Volume down"
1 - no effect but tpb reports "Volume up"
@ -346,26 +374,18 @@ ThinkPad Buttons utility):
13 - ThinkLight off
14 - no effect but tpb reports ThinkLight status change
If you try this feature, please send me a report similar to the
above. On models which allow control of LCD brightness or sound
volume, I'd like to provide this functionality in an user-friendly
way, but first I need a way to identify the models which this is
possible.
Experimental: LED control - /proc/acpi/ibm/LED
----------------------------------------------
LED control -- /proc/acpi/ibm/led
---------------------------------
Some of the LED indicators can be controlled through this feature. 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
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> parameter is a non-negative integer. The range of LED
numbers used internally by various models is 0 to 7 but it's possible
that numbers outside this range are also valid. Here is the mapping on
the X40:
The <led number> range is 0 to 7. The set of LEDs that can be
controlled varies from model to model. Here is the mapping on the X40:
0 - power
1 - battery (orange)
@ -376,49 +396,224 @@ the X40:
All of the above can be turned on and off and can be made to blink.
If you try this feature, please send me a report similar to the
above. I'd like to provide this functionality in an user-friendly way,
but first I need to identify the which numbers correspond to which
LEDs on various models.
Experimental: ACPI sounds - /proc/acpi/ibm/beep
-----------------------------------------------
ACPI sounds -- /proc/acpi/ibm/beep
----------------------------------
The BEEP method is used internally by the ACPI firmware to provide
audible alerts in various situtation. This feature allows the same
audible alerts in various situations. This feature allows the same
sounds to be triggered manually.
The commands are non-negative integer numbers:
echo 0 >/proc/acpi/ibm/beep
echo 1 >/proc/acpi/ibm/beep
echo 2 >/proc/acpi/ibm/beep
...
echo <number> >/proc/acpi/ibm/beep
The range of numbers which are used internally by various models is 0
to 17, but it's possible that numbers outside this range are also
valid. Here is the behavior on the X40:
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:
2 - two beeps, pause, third beep
0 - stop a sound in progress (but use 17 to stop 16)
2 - two beeps, pause, third beep ("low battery")
3 - single beep
4 - "unable"
4 - high, followed by low-pitched beep ("unable")
5 - single beep
6 - "AC/DC"
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
(I've only been able to identify a couple of them).
Temperature sensors -- /proc/acpi/ibm/thermal
---------------------------------------------
If you try this feature, please send me a report similar to the
above. I'd like to provide this functionality in an user-friendly way,
but first I need to identify the which numbers correspond to which
sounds on various models.
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. Some
readings may not be valid, e.g. may show large negative values. For
example, on the X40, a typical output may be:
temperatures: 42 42 45 41 36 -128 33 -128
Thomas Gruber took his R51 apart and traced all six active sensors in
his laptop (the location of sensors may vary on other models):
1: CPU
2: Mini PCI Module
3: HDD
4: GPU
5: Battery
6: N/A
7: Battery
8: N/A
No commands can be written to this file.
EXPERIMENTAL: Embedded controller reigster dump -- /proc/acpi/ibm/ecdump
------------------------------------------------------------------------
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 dumps the values of 256 embedded controller
registers. Values which have changed since the last time the registers
were dumped are marked 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 *26 *2c *27 *20 80 *1f 80
EC 0x80: 00 00 00 06 *37 *0e 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
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.)
EXPERIMENTAL: LCD brightness control -- /proc/acpi/ibm/brightness
-----------------------------------------------------------------
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 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.
EXPERIMENTAL: Volume control -- /proc/acpi/ibm/volume
-----------------------------------------------------
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 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. 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.
The fan may be enabled or disabled with the following commands:
echo enable >/proc/acpi/ibm/fan
echo disable >/proc/acpi/ibm/fan
WARNING WARNING WARNING: do not leave the fan disabled unless you are
monitoring the temperature sensor readings and you are ready to enable
it if necessary to avoid overheating.
The fan only runs if it's enabled *and* the various temperature
sensors which control it read high enough. 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.
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.
On the 570, temperature readings are not available through this
feature and the fan control works a little differently. The fan speed
is reported in levels from 0 (off) to 7 (max) and can be controlled
with the following command:
echo 'level <level>' > /proc/acpi/ibm/thermal
Multiple Command, Module Parameters
-----------------------------------
Multiple Commands, Module Parameters
------------------------------------
Multiple commands can be written to the proc files in one shot by
separating them with commas, for example:
@ -451,24 +646,19 @@ scripts (included with ibm-acpi for completeness):
/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@control.uchicago.edu> has written a SuSE powersave
script for the X20, included in config/usr/sbin/ibm_hotkeys_X20
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, included in
configs/etc/acpi/actions/blank-debian.sh
TODO
----
I'd like to implement the following features but haven't yet found the
time and/or I don't yet know how to implement them:
- UltraBay floppy drive support
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.

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drivers/acpi/ibm_acpi.c
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