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I know we had a lots of questions about that problem but none worked for me. I have a dual boot with Windows 10 and Ubuntu 14.04 but cannot change the brightness level just when I use Linux. The only way I've found to change it is using Nvidia Xserver application but I had read that this is not the properly way to do that. When I try to decrease the brightness level the bar on the top of the screen appears and tells me that it's decreasing but nothing happens. Please, help me.

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Same issue here. Used this link and it works perfectly now. Although updating to the latest version of Ubuntu fixes it as well. http://itsfoss.com/fix-brightness-ubuntu-1310/

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    Don't just post a link. Summarise what the link tells you to do. Links die and links change. – cas Nov 19 '15 at 6:08
  • Thanks for answering. Did you use this solution with Ubuntu 14.04 too ? – André Rocha Nov 19 '15 at 23:27

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