Using a direct access to /sys/class/backlight
My Debian laptop is configured with a very minimal setup, using i3 as window manager and without any graphical tool for system management.
To manage the screen brightness i choosed not using a specific command line tool: i use the script below that directly access to the backlight handler under
The script allow to increase or decrease the screen brightness with a single paramether passing the variation percentage:
# brightness.sh +20 (Increase brightness by 20%)
# brightness.sh -20 (Decrease brightness by 20%)
Finally, i have mapped this script to the functions keys of my laptop, with this lines in ~/.i3/config
bindsym XF86MonBrightnessUp exec brightness.sh +20 bindsym XF86MonBrightnessDown exec brightness.sh -20