gsettings set org.gnome.desktop.interface scaling-factor 2
# gsettings set org.gnome.settings-daemon.plugins.xsettings overrides "[{'Gdk/WindowScalingFactor', <1>}]"
# killall -HUP gnome-shell
xrandr --output eDP-1 --off
xrandr --output DP-1-2 --scale 2x2 --panning 3840x2400+3840+0 --pos 3840x0
xrandr --output DP-1-1 --scale 2x2 --panning 3840x2400 --pos 0x0 --primary