Brightness issue

Hello guys, anyone can help me to change the fucking brightness on my slimbook?
The GPU is a randeon 7290

At the terminal
xbacklight +10
xbacklight -10

Or pacman -S monica

Or pacman -S displaycal

The latter is good full.

There’s some fucking good ideas on this bastard ArchWiki page:


What @Head_on_a_Stick said.

Let’s keep that language under control @Apoo