Can you try adding this line:
Option "RegistryDwords" "EnableBrightnessControl=1"
to your /etc/X11/xorg.conf at the bottom of the device section? It's not
something we can globally enable but it does fix many issues similar to
this.
** Changed in: nvidia-graphics-drivers-180 (Ubuntu)
Status: New => Incomplete
** Changed in: nvidia-graphics-drivers-180 (Ubuntu)
Importance: Undecided => Low
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Asus M50SV Nividia Geforce 9500M brightness
https://bugs.launchpad.net/bugs/415846
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