https://bugzilla.kernel.org/show_bug.cgi?id=14216





--- Comment #41 from Stefano Cavallari <spiky.k...@gmail.com>  2010-09-21 
14:01:43 ---
I tried both the pci command and boot option, they work! 

The brightness buttons work, but I cannot change the brightness using
/proc/acpi.
I see these directories in /proc:

/proc/acpi/video/GFX0/
DD01/ DD02/ DD03/ DD04/ DD05/

only DD03 has the "brightness" file but changing values does not work.
# cat /proc/acpi/video/GFX0/DD03/brightness 
levels:  0 14 28 42 56 70 84 100
current: 28

The "current" value updates, but the screen does not follow it.

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