Additional note to my previous comment: this is on a Debian Unstable,
with proprietary nvidia module (280.13-4). Not sure if this can work
with nouveau.
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I can confirm the problem on a Dell XPS l702x with 3D NVidia GT 555m
I have solved the problem here by adding the following to xorg.conf:
Option "RegistryDwords" "EnableBrightnessControl=1"
Hope this helps,
Pierre
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