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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}}