I have dell vostro 3500 and added this line to my /etc/Xorg/xorg.conf
Option "RegistryDwords" "EnableBrightnessControl=1"
in Section "device"
this solved the issue for me. Theyve changed sth in drivers so this is now
needed to control brightness which is pretty stupid but its good to know this :]
Hope it helps,
cheers
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Brightness Control doesn't work on Dell Vostro 1000
https://bugs.launchpad.net/bugs/159255
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