Public bug reported:
This is a bug similar to bug #53606 and bug #68734. I have it in Ubuntu
Gutsy on Thinkpad X40.
However, in my case, the special function keys *do* work, at least most
of them.
What does not work, however, is the key for switching between external
monitor and LCD. The external monitor is switched on.
I looked into /proc/acpi/ibm, which you can use to manually set different
laptop options. In a previous version of Ubuntu, the problem was that you could
only switch between the options "LCD only" and "CRT only", to have them both,
you needed to
echo crt_enable > /proc/acpi/ibm/video
The following special function keys work:
- brightness up/down (however, the brightness applet does not work, shows a
little red crossed circle on the applet icon)
- lcd light (the tiny light in the lcd bezel) on/off
- sound up/down/mute (the respective applet works as well)
- sleep
- screen blank
The following do not work:
- switch between external crt/ laptop lcd. Both are normally on.
Not tested:
- hibernate
- dock
I took a look into /proc/acpi/ibm.
It is populated almost as it should (beep, brightness, cmos, driver,
ecdump, fan, hotkey, led, light, thermal, video, volume, but not dock,
which I think should be there as well?). Any case, thinkpad_acpi module
is loaded as it should be.
I tried to use the trick that worked fine in previous Ubuntu versions:
echo on > light
cool, the little light in the lcd bezel turn on. So, the acpi proc system works.
volume works as well (echo up > volume etc.)
lets try with what worked so well:
echo crt_disable > video
no error message, but the crt is still on. same for other commands for the
video - no error, but also no effect. dmesg does not tell me anything
interesting.
Interestingly: I did a typo while playing with these commands, and from
then on until the next reboot I got the messages "write error: Incorrect
argument" when trying to do anything.
When I boot with acpi=off, following works:
- suspend button (but suspend itself does not work properly, the screen is not
correctly restored, at least when the 3D is not on)
- blank screen button
- brightness button
- lcd light button (the tiny light on top of the lcd bezel)
Following does not work:
- wireless on/off
- sound up/down/mute
- switch between external screen and LCD
Not tested:
- docking button
- hibernate button
Further thing observed: when I boot with the external monitor switched on, (and
with acpi), then going to a text console does not work (blank screen)
Feel free to ask me for just any log / listing / configuration. I am
really annoyed by this problem and considering to downgrade to a
previous Ubuntu version. I need to regularly give presentations and I
must have a convenient way of controlling which of the two screens is
on.
** Affects: ubuntu
Importance: Undecided
Status: New
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Problems with /proc/acpi/ibm on Thinkpad X40
https://bugs.launchpad.net/bugs/164471
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