xbacklight - Man Page

adjust backlight brightness using RandR extension

Examples (TL;DR)


xbacklight [-help]  [-display display] [-get] [-set percent] [-inc percent] [-dec percent]


Xbacklight is used to adjust the backlight brightness where supported. It finds all outputs on the X server supporting backlight brightness control and changes them all in the same way.


Print out the current backlight brightness of each output with such a control. The brightness is represented as a percentage of the maximum brightness supported.

-set percent

Sets each backlight brightness to the specified level.

-inc percent

Increases brightness by the specified amount.

-dec percent

Decreases brightness by the specified amount.


Print out a summary of the usage and exit.


Print out the program version and exit.

-time milliseconds

Length of time to spend fading the backlight between old and new value. Default is 200.

-steps number

Number of steps to take while fading. Default is 20.

See Also



Keith Packard, Open Source Technology Center, Intel Corporation.

Referenced By


xbacklight 1.2.3 X Version 11