IBM ThinkPad ACPI Extras Driver Version 0.8 8 November 2004 Borislav Deianov 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. Status ------ The features currently supported are the following (see below for detailed description): - Fn key combinations - Bluetooth enable and disable - video output switching, expansion control - ThinkLight on and off - limited docking and undocking - UltraBay eject - Experimental: CMOS control - Experimental: LED control - Experimental: ACPI sounds A compatibility table by model and feature is maintained on the web site, http://ibm-acpi.sf.net/. I appreciate any success or failure reports, especially if they add to or correct the compatibility table. Please include the following information in your report: - ThinkPad model name - a copy of your DSDT, from /proc/acpi/dsdt - which driver features work and which don't - the observed behavior of non-working features Any other comments or patches are also more than welcome. Installation ------------ If you are compiling this driver as included in the Linux kernel sources, simply enable the CONFIG_ACPI_IBM option (Power Management / ACPI / IBM ThinkPad Laptop Extras). The rest of this section describes how to install this driver when downloaded from the web site. First, you need to get a kernel with ACPI support up and running. Please refer to http://acpi.sourceforge.net/ for help with this step. How successful you will be depends a lot on you ThinkPad model, the kernel you are using and any additional patches applied. The kernel provided with your distribution may not be good enough. I needed to compile a 2.6.7 kernel with the 20040715 ACPI patch to get ACPI working reliably on my ThinkPad X40. Old ThinkPad models may not be supported at all. Assuming you have the basic ACPI support working (e.g. you can see the /proc/acpi directory), follow the following steps to install this driver: - unpack the archive: tar xzvf ibm-acpi-x.y.tar.gz; cd ibm-acpi-x.y - compile the driver: make - install the module in your kernel modules directory: make install - load the module: modprobe ibm_acpi After loading the module, check the "dmesg" output for any error messages. Features -------- The driver creates the /proc/acpi/ibm directory. There is a file under that directory for each feature described below. Note that while the 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 -------------------------------------- The driver name and version. No commands can be written to this file. Hot Keys -- /proc/acpi/ibm/hotkey --------------------------------- Without this driver, only the Fn-F4 key (sleep button) generates an ACPI event. With the driver loaded, the hotkey feature enabled and the mask set (see below), the various hot keys generate ACPI events in the following format: ibm/hotkey HKEY 00000080 0000xxxx The last four digits vary depending on the key combination pressed. All labeled Fn-Fx key combinations generate distinct events. In addition, the lid microswitch and some docking station buttons may also generate such events. The following commands can be written to this file: echo enable > /proc/acpi/ibm/hotkey -- enable the hot keys feature echo disable > /proc/acpi/ibm/hotkey -- disable the hot keys feature echo 0xffff > /proc/acpi/ibm/hotkey -- enable all possible hot keys echo 0x0000 > /proc/acpi/ibm/hotkey -- disable all possible hot keys ... any other 4-hex-digit mask ... echo reset > /proc/acpi/ibm/hotkey -- restore the original mask The bit mask allows some control over which hot keys generate ACPI events. Not all bits in the mask can be modified. Not all bits that can be modified do anything. Not all hot keys can be individually controlled by the mask. Most recent ThinkPad models honor the following bits (assuming the hot keys feature has been enabled): key bit behavior when set behavior when unset Fn-F3 always generates ACPI event Fn-F4 always generates ACPI event Fn-F5 0010 generate ACPI event enable/disable Bluetooth Fn-F7 0040 generate ACPI event switch LCD and external display Fn-F8 0080 generate ACPI event expand screen or none Fn-F9 0100 generate ACPI event none Fn-F12 always generates ACPI event Some models do not support all of the above. For example, the T30 does not support Fn-F5 and Fn-F9. Other models do not support the mask at all. On those models, hot keys cannot be controlled individually. Note that enabling ACPI events for some keys prevents their default behavior. For example, if events for Fn-F5 are enabled, that key will no longer enable/disable Bluetooth by itself. This can still be done from an acpid handler for the ibm/hotkey event. Note also that not all Fn key combinations are supported through ACPI. For example, on the X40, the brightness, volume and "Access IBM" buttons do not generate ACPI events even with this driver. They *can* be used through the "ThinkPad Buttons" utility, see http://www.nongnu.org/tpb/ Bluetooth -- /proc/acpi/ibm/bluetooth ------------------------------------- This feature shows the presence and current state of a Bluetooth device. If Bluetooth is installed, the following commands can be used: echo enable > /proc/acpi/ibm/bluetooth echo disable > /proc/acpi/ibm/bluetooth 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 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 sumulates 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. ThinkLight control -- /proc/acpi/ibm/light ------------------------------------------ The current status of the ThinkLight can be found in this file. A few models which do not make the status available will show it as "unknown". The available commands are: echo on > /proc/acpi/ibm/light echo off > /proc/acpi/ibm/light Docking / Undocking -- /proc/acpi/ibm/dock ------------------------------------------ Docking and undocking (e.g. with the X4 UltraBase) requires some actions to be taken by the operating system to safely make or break the electrical connections with the dock. The docking feature of this driver generates the following ACPI events: ibm/dock GDCK 00000003 00000001 -- eject request ibm/dock GDCK 00000003 00000002 -- undocked ibm/dock GDCK 00000000 00000003 -- docked 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). When the eject request button on the dock is pressed, the first event above is generated. The handler for this event should issue the following command: echo undock > /proc/acpi/ibm/dock After the LED on the dock goes off, it is safe to eject the laptop. Note: if you pressed this key by mistake, go ahead and eject the laptop, then dock it back in. Otherwise, the dock may not function as expected. When the laptop is docked, the third event above is generated. The handler for this event should issue the following command to fully enable the dock: echo dock > /proc/acpi/ibm/dock The contents of the /proc/acpi/ibm/dock file shows the current status of the dock, as provided by the ACPI framework. The docking support in this driver does not take care of enabling or disabling any other devices you may have attached to the dock. For example, a CD drive plugged into the UltraBase needs to be disabled or enabled separately. See the provided example acpid configuration files for how this can be accomplished. There is no support yet for PCI devices that may be attached to a docking station, e.g. in the ThinkPad Dock II. The driver currently does not recognize, enable or disable such devices. This means that 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 ------------------------------------ Inserting or ejecting an UltraBay device requires some actions to be taken by the operating system to safely make or break the electrical connections with the device. This feature generates the following ACPI events: ibm/bay MSTR 00000003 00000000 -- eject request ibm/bay MSTR 00000001 00000000 -- eject lever inserted NOTE: These events will only be generated if the UltraBay was present 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 command described below still works. It can be executed manually or triggered by a hot key combination. Sliding the eject lever generates the first event shown above. The handler for this event should take whatever actions are necessary to shut down the device in the UltraBay (e.g. call idectl), then issue the following command: echo eject > /proc/acpi/ibm/bay After the LED on the UltraBay goes off, it is safe to pull out the device. When the eject lever is inserted, the second event above is generated. The handler for this event should take whatever actions are 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 --------------------- 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. Experimental: 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. The commands are non-negative integer numbers: echo 0 >/proc/acpi/ibm/cmos echo 1 >/proc/acpi/ibm/cmos 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): 0 - no effect but tpb reports "Volume down" 1 - no effect but tpb reports "Volume up" 2 - no effect but tpb reports "Mute on" 3 - simulate pressing the "Access IBM" button 4 - LCD brightness up 5 - LCD brightness down 11 - toggle screen expansion 12 - ThinkLight on 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 ---------------------------------------------- Some of the LED indicators can be controlled through this feature. The available commands are: echo on >/proc/acpi/ibm/led echo off >/proc/acpi/ibm/led echo blink >/proc/acpi/ibm/led The 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: 0 - power 1 - battery (orange) 2 - battery (green) 3 - UltraBase 4 - UltraBay 7 - standby 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 ----------------------------------------------- The BEEP method is used internally by the ACPI firmware to provide audible alerts in various situtation. 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 ... 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: 2 - two beeps, pause, third beep 3 - single beep 4 - "unable" 5 - single beep 6 - "AC/DC" 7 - high-pitched beep 9 - three short beeps 10 - very long beep 12 - low-pitched beep (I've only been able to identify a couple of them). 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. Multiple Command, 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 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 Toan T Nguyen has written a SuSE powersave script for the X20, included in config/usr/sbin/ibm_hotkeys_X20 Henrik Brix Andersen 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 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