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I try to change the screen brightness on Linux Mint! The keys are showing a change, but the screen keeps at full denisity. Changing the /sys/class/backlight/apple_backlight/backlight file has also no effect. Maybe an idea?

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Yeah...you could tell us what hardware you have... –  Bobby Jul 17 '13 at 13:42
    
In addition to the hardware, please mention which Mint you are using and which desktop environment. –  terdon Jul 17 '13 at 14:06
    
heres my hardware: everymac.com/systems/apple/macbook/specs/… –  MIC Jul 17 '13 at 14:07
    
I`m running Linux Mint 15/Cinnamon –  MIC Jul 17 '13 at 14:08
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