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I'm working on an Acer Aspire E15 with Ubuntu Studio 14.04 installed in dual-boot with Windows 8.1, and from Ubuntu I'm not able to modify the screen brightness, for two reasons.

The first is that I don't find the option in the settings menu.

The second is that if I use the keyboard commands (Fn+left/right arrow) I receive this on-screen notification:

luminosity notification

Despite the blue bar you see in the notification moves itself according to what I press, the brightness doesn't change.

On Windows I don't have such problem, so I know it's not an hardware issue.

How can I proceed to make it work?

UPDATE:

I tried this solution, but nothing has changed.

UPDATE 2:

Also this solution didn't work.

UPDATE 3:

The problem solved itself after an automatic system update shortly after I posted this message. But now I noticed it reappeared. So I'm undeleting this post.

1 Answer 1

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I followed this solution and it worked.

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