where is backlight brightness set linux code example
Example: linux screen brightness command line
$ xrandr | grep " connected" | cut -f1 -d " "
VGA1
$ xrandr --output VGA1 --brightness 0.7
$ xrandr | grep " connected" | cut -f1 -d " "
VGA1
$ xrandr --output VGA1 --brightness 0.7