Comment 49 for bug 935778

I loked in /sys/ for all files containing the value "bright". Then I changed the brightness of the screen using the Keys Fnn+F6/F7 and watched for the changes in the files. The tabular is in the attached file:"Files in /sys/containig bright and their values"

I mentioned that the value of /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight/actual_brightness is always constant after a suspend. Before the suspend it changed.

To change the brightness after suspend I did the following:

#su
#echo 320 > /sys/class/backlight/intel_backlight/brightness

Now the file
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight/actual_brightness

contains the same value as given in the above comand and display brightness is really changed.

I tested this with 3.1.0-1.2-desktop and 3.2.0.6449 Vanilla. On both this workaround works fine to change brightness, but the keys Fn+F6/F7 are stil not working.