Setting screen backlight
https://wiki.archlinux.org/index.php/backlight
In my case:
sudo tee /sys/class/backlight/radeon_bl0/brightness <<< 200
Nel mezzo del deserto posso dire tutto quello che voglio.
In the middle of the desert you can say anything you want
https://wiki.archlinux.org/index.php/backlight
In my case:
sudo tee /sys/class/backlight/radeon_bl0/brightness <<< 200