setres

#!/bin/bash

primary="$( xrandr -q | awk '/ connected primary/{split($0,a," "); print a[1]}' | head -n 1 )"
secondary="$( xrandr -q | awk '!/primary/{print}' | awk '/ connected/{split($0,a," "); print a[1]}' | head -n 1 )"

hi () {
  xrandr --output $primary --mode '3200x1800' --pos '0x1040'
  xrandr --output $secondary --mode '3840x2160' --pos '3200x0' --rotate 'left'
  gsettings set org.gnome.desktop.interface scaling-factor 2
  gsettings set org.gnome.settings-daemon.plugins.xsettings overrides "{'Gdk/WindowScalingFactor': <2>}"
  gsettings set com.ubuntu.user-interface scale-factor "{'$primary': 16, '$secondary': 16}"
}

lo () {
  xrandr --output $primary --mode '1920x1080' --pos '0x750'
  xrandr --output $secondary --mode '2560x1440' --pos '1920x0' --rotate 'left'
  gsettings set org.gnome.desktop.interface scaling-factor 1
  gsettings set org.gnome.settings-daemon.plugins.xsettings overrides "{'Gdk/WindowScalingFactor': <1>}"
  gsettings set com.ubuntu.user-interface scale-factor "{'$primary': 8, '$secondary': 8}"
}

case "$1" in 
  hi)
    hi
    ;;
  lo)
    lo
    ;;
  *)
    echo "Usage: $0 (hi|lo)"
    exit 1

esac