The ubuntu seems to be always on the max brightness.
I cannot change the brightness. Really strange.
What I have tried:
1 Install the latest Nvidia Driver does not work
2 change x
sudo gedit /etc/X11/xorg.conf
Section "Device"
Identifier "Default Device"
Driver "nvidia"
Option "NoLogo" "True"
Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection
This would make the fn+ key successfully change the value of /sys/class/backlight/acpi_video0/brightness
and actual_brightness
However the brightness will still stay the maximum.
nvidiabl
as described in this answer? It doesn't work for all machines, but you can give it a shot. – gertvdijk Jan 07 '13 at 09:17