xbacklight
adjust backlight brightness using RandR extension
TLDR
Get the current screen brightness as a percentage
Set the screen brightness to 40%
Increase current brightness by 25%
Decrease current brightness by 75%
Increase backlight to 100%, over 60 seconds (value given in ms), using 60 steps
SYNOPSIS
xbacklight [-help] [-display display] [-get] [-set percent] [-inc percent] [-dec percent]
DESCRIPTION
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.
- -get
-
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.
- -help
-
Print out a summary of the usage 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.
AUTHORS
Keith Packard, Open Source Technology Center, Intel Corporation.
SEE ALSO
Xrandr(3)