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I have a HP Elitebook 8560w and I installed Ubuntu 12.04 on it. I can't adjust the screen brightness even though I can use the slider to lower the screen brightness, it doesn't have any effect. I searched a lot about this, but nothing seems to work. I edited the grub file, but it still doesn't work. I installed xbacklight, and if I use the command "xbacklight -20" the brightness still doesn't change. So is there even a way to fix this, because it seems I tried almost everything.

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Unfortunately for this, I firmly believe this is a bug in the kernel itself. I've been experiencing similar problem on my old HP dv2210us and my new Asus U31SD-XH51. Best thing is to try report this and keep your fingers crossed that Ubuntu Team will do something about it. –  damystica Mar 19 '13 at 12:33
    
What kind of graphics card do you have? I have the elitebook 8560w (also on 12.04) with an amd firepro card, and using the brightness keys works for me. I remember having trouble with brightness before but i think (if i remember correctly) for me it got fixed when installing proprietary drivers for my gpu. –  Thaemes Jun 13 '13 at 10:50
    
What graphics card do you have and what drivers do you have installed? I have an 8570w with Nvidia Quadro card and it is a horrible PITA to get brightness to work. –  gertvdijk Jun 13 '13 at 12:15
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