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xrandr

Set the size, orientation and/or reflection of the outputs for a screen.

More information.

• Display the current state of the system (known screens, resolutions, ...):

xrandr --query

• Disable disconnected outputs and enable connected ones with default settings:

xrandr --auto

• Change the resolution and update frequency of DisplayPort 1 to 1920x1080, 60Hz:

xrandr --output {DP1} --mode {1920x1080} --rate {60}

• Set the resolution of HDMI2 to 1280x1024 and put it on the right of DP1:

xrandr --output {HDMI2} --mode {1280x1024} --right-of {DP1}

• Disable the VGA1 output:

xrandr --output {VGA1} --off

• Set the brightness for LVDS1 to 50%:

xrandr --output {LVDS1} --brightness {0.5}

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