This is still a problem, and not solved by the Nvidia guys.
https://devtalk.nvidia.com/default/topic/539462/linux/-nvidia-319-12
-brightness-controls-not-working-on-laptop-ubuntu-13-03-/4/
So no solution yet for us...
** Changed in: xorg (Ubuntu)
Status: Expired => Confirmed
** Also affects: nvidia-graphics-drivers-346 (Ubuntu)
Importance: Undecided
Status: New
** Also affects: nvidia-graphics-drivers-340 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1281019
Title:
10de:0dda [HP EliteBook 8560w] Brightness controls are not working
nvidia-319 and nvidia-331
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