backlight dimming works, just not in kde....

lokuarachi · n00b Joined: 23 Aug 2004 Posts: 33 Location: Jamaica

Hey all,

so i can dim my backlight using the special keys with pommed, by echoing various number into /sys/class/backlight/mbp_backlight/brightness........but once i am in kde the keys dont work, echoing doesnt work and the slider bar thingy in kde doesnt work.......any suggestions?

Laptop in question is a macbook.
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honp · Posted: Tue Jun 16, 2009 2:19 pm Post subject:

The same happens to me in Gnome. I have:
01:00.0 VGA compatible controller: nVidia Corporation Quadro NVS 130M (rev a1)
and
nvidia-drivers-180.60 drivers.

d2_racing · Posted: Tue Jun 16, 2009 2:23 pm Post subject:

Maybe inside the Kde Configuration Center, there is an option inside the monitor section to lock the brightness.

199599 · n00b Joined: 05 May 2009 Posts: 9

I've got the same problem on my laptop with a Gforce 9600M GT. The problem for me however is neither KDE nor Gnome, but the Nvidia X driver.
In a non-X console I can change the backlight brightness by echoing values to the appropriate /sys/class file, just like lokuarachi. Using the nv drivers, instead of the official Nvidia drivers fixes the problem too (which is not a long term solution since these have no 3D acceleration

).
Other users seem to have the same problem. I filled a bug report to Nvidia, but never got an answer.
The same bug might apply for you lokuarachi, since some macbooks have Nvidia graphic chips.