xbacklight

Utility to adjust backlight brightness using the RandR extension. More information: https://manned.org/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}}