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kernel-aes67/Documentation/ibm-acpi.txt
Borislav Deianov 78f81cc435 [ACPI] IBM ThinkPad ACPI Extras Driver v0.12 
http://ibm-acpi.sf.net/

Signed-off-by: Borislav Deianov <borislav@users.sf.net>
Signed-off-by: Len Brown <len.brown@intel.com>
2005-08-25 17:37:51 -04:00

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IBM ThinkPad ACPI Extras Driver
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 supports
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
- 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
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 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: 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
------------------------------------------
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:
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
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:
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.
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 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):
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:
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 may 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 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"
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
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
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)
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.
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 -- /proc/acpi/ibm/thermal
---------------------------------------------
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 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
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.
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