Xrandr
From wikinotes
Xrandr allows you to manipulate query and manipulate display settings.
Position/Resolution
xrandr --output VGA-1 --mode 1920x1080 # set resolution xrandr # query outputs/modes xrandr --listmonitors # list outputs xrandr --output VGA1 --off \ --output HDMI1 --off \ --output LVDS1 --left-of HDMI1 --auto
Brightness
xrandr --output LVDS1 --brightness 0.7