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xrandr --output <outputname> --brightness <value>
If the driver of your graphics card supports it, then you can use xrandr.
The following command lists the current configuration:
xrandr --current --verbose
If you want to change the configuration of an output, then you need the name of the output. This name is part of the output of xrandr --current, for example LVDS1.
The brightness can be changed like this:
xrandr --output <outputname> --brightness 0.8
xrandr --output <outputname> --gamma 0.5:1.0:1.0
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