On Sat, 26 Sep 2009, Paride Legovini wrote:
> I set THINKPAD_ACPI_VIDEO=n, following this option's help suggestion
> ("If you can use X.org's RandR ... don't think twice: do it and say N").
> Thus (?) I don't have /sys/class/backlight/thinkpad_screen/, but I do
> have /sys/devices/virtual/backlight/acpi_video0 and I can control the
> brightness level from there. So, is this control related to
> thinkpad-acpi at all?
It *could* be. I don't think it is, if you don't have
/sys/class/backlight/thinkpad_screen/ that means thinkpad-acpi is not
supposed to touch the brightness stuff at all, no matter what.
However, I have seen weirder things happen, so I am not going to dismiss a
possible bug in thinkpad-acpi right away.
> Until 2.6.30 kernels (included) the brightness level was retained after
> the resume.
And the firmware tries to retain it, so you need something actively breaking
things to have the brightness getting reset to 0 on resume/shutdown/reboot.
> Yes: Intel Corporation Mobile 945GM/GMS, 943/940GML, and I'm using KMS.
Well, I wouldn't be surprised if there is a bug in KMS or on ACPI video's
interaction with KMS at all. In that case, linux-acpi@xxxxxxxxxxxxxxx
should be able to help you.
Still, you might want to send me the debug dumps to at least rule out
anything obvious thinkpad-acpi might be doing, first.
--
"One disk to rule them all, One disk to find them. One disk to bring
them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot
Henrique Holschuh
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