Configure Dell XPS 13' with HiDPI and external monitor

set_monitors

#!/bin/sh

one_monitor () {
	echo "Configure one monitor!"
	# Window scaling down
	gsettings set org.gnome.desktop.interface scaling-factor 2
	xrandr --output eDP1 --mode 3200x1800 --primary --scale 1x1 --output HDMI1 --off
}

two_monitors () {
	echo "Configure two monitors!"
	# Window scaling down
	gsettings set org.gnome.desktop.interface scaling-factor 1
	# Configure screens layout and resolucion
	xrandr --output HDMI1 --mode 1920x1080 --pos 0x0 --rotate normal --primary --output DP1 --off --output eDP1 --mode 1920x1080 --pos 1920x0 --rotate normal --output VIRTUAL1 --off
}

IN="eDP1"
EXT="HDMI1"

if (xrandr | grep "$EXT disconnected"); then
	one_monitor
else
	two_monitors
fi

set_monitors instructions

1. Create folder: mkdir ~/opt/monitors/bin
2. Copy script in the bin folder
3. Add folder to PATH add to .bashrc this: export PATH=$PATH:~/opt/monitors/bin
4. Use the script executing "set_monitor 1" or "set_monitor 2"