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I can't change my brightness on my laptop and I would like a help to solve this problem.

Using kcmshell4 kgamma I can change the constrast. But using xbacklight nothing happens.

If I put

xbacklight -get

I got a value, for example, 86.666667, but when I try

xbacklight -dec 40

Nothing happens.

The strange thing is that commands above (xbacklight -dec 40) can work if I suspend my session and reopen it again.

How can I solve this?

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Try using the

xbacklight -set


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