Automatic external monitor switch on Arch Linux

Install autorandr.

sudo pacman -S autorandr

Save current configuration. If you are on notebook you can eg. call it mobile.

autorandr --save mobile

Now connect you external monitor. Change the monitor settings as you wish and save it.

autorandr --save docked

From now on, when you connect external monitor it will automatically switch to it. If you disconnect it it will revert back internal monitor only.

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