On my laptop, I can change brightness easily with function keys on the keyboard, but how do I adjust the contrast?
With an external monitor, there's buttons and an OSD, but the laptop display is totally integrated. What to do?
xgamma to the rescue!
xgamma -gamma 0.7 makes it a bit darker
xgamma -gamma 1.2 makes it a bit lighter
You can also use xrandr:
xrandr by itself will give you a list of your display outputs
xrandr --output VGA-1 --gamma 1.2:1.2:1.2
xrandr --output LVDS-1 --gamma 0.7:0.7:0.7
will set your different outputs to different gamma settings
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