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One could try fiddling with negative gamma-values and brightness-values < 1 to generate a negative gamma-ramp on a specific output. xrandr --output [output] --gamma -0.5:-0.5:-0.5 --brightness 0.1 this suffices at least to me and works out of the box, but does not take into account any existing gamma-curves for an output. might be worth a shot. ...

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