Ever Since I Upgraded to Ubuntu 13.04, the Brightness lock doesn’t work, After every few seconds it keeps reverting back to highest brightness level. While, I haven’t figured out the perfect solution, I relatively less painful temporary fix.
Only when I use the Fn + brightness keys in the keyboard, the brightness keeps reverting back to highest brightness. However, When I open the “Brightness & Lock” and drag the brightness slider, it seems to maintain the brightness setting until shutdown. Unfortunately after booting up I have to do this again.
Here the setting I use in 13.04
Hope it helps!
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