Re: [gentoo-user] power management cannot change LCD brightness

[roundyz@hotmail.ru]

Frank Steinmetzger wrote:

>> Am Sonntag 28 Februar 2010 schrieb Xi Shen:
>> > hi,
>> > 
>> > my system is gentoo amd64, kde 4.3. my laptop is thinkpad t61. after
>> > some configure in the kernel, and reboot with the new kernel, i can
>> > use the Fn+Home, and Fn+End to change the brightness of my lcd. but
>> > when i tried to change the lcd brightness by dragging the handle on
>> > the 'power management' tool, nothing happens. what else should i
>> > configure?
>> 
>> It has never worked here, though I???m satisfied that I can use Fn+Crsr up/down, 
>> which works on the HW level (even at boot).
>> -- 
>> Gru?? | Greetings | Qapla'
>> 
>> Never argue with an idiot.
>> He brings you down to his level, then beats you with experience.

Hi,
fisrt see if proc and your kernel has it right, do:
 cat  /proc/acpi/video/GFX0/DD02/brightness 

should give something like 

levels:  13 25 38 50 63 75 88 100
current: 13

if that works, check permissions on the file and try to echo a level
number to it..

echo 13 > /proc/acpi/video/GFX0/DD02/brightness 

it it changes then its down to the app, check the use flags of the app,
and see whats missing.

good luck


-- 
Regards,
Roundyz