xbacklight
Utility to adjust backlight brightness using the RandR extension.
More information: https://gitlab.freedesktop.org/xorg/app/xbacklight.
- Get the current screen brightness as a percentage:
xbacklight
- Set the screen brightness to 40%:
xbacklight -set 40
- Increase current brightness by 25%:
xbacklight -inc 25
- Decrease current brightness by 75%:
xbacklight -dec 75
- Increase backlight to 100%, over 60 seconds (value given in ms), using 60 steps:
xbacklight -set 100 -time 60000 -steps 60