xbacklight - Man Page
adjust backlight brightness using RandR extension
- Get the current screen brightness as a percentage:
- 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
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.
Keith Packard, Open Source Technology Center, Intel Corporation.