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xrandr

Set the size, orientation and/or reflection of the outputs for a screen. More information: https://www.x.org/releases/current/doc/man/man1/xrandr.1.xhtml.

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}}

Display the current state of any X server:

xrandr --display :{{0}} --query