I found a workaround here:
http://ubuntuforums.org/showthread.php?t=2181534
create the file /usr/share/X11/xorg.conf.d/20-intel.conf with the following
content:
Code:
Section "Device"
Identifier "card0"
Driver "intel"
Option "Backlight" "intel_backlight"
BusID "PCI:0:2:0"
EndSection
...and log out and back in again
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https://bugs.launchpad.net/bugs/1232952
Title:
Brightness controls do not change brightness
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