I can't change my brightness on my laptop and I would like a help to solve this problem.
kcmshell4 kgamma I can change the constrast. But using
xbacklight nothing happens.
If I put
I got a value, for example,
86.666667, but when I try
xbacklight -dec 40
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?