xbacklight - adjust backlight brightness using RandR extension
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
- -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.
- Length of time to spend fading the backlight between old and new value.
Default is 200.
- Number of steps to take while fading. Default is 20.
Keith Packard, Open Source Technology Center, Intel