xrandr script for ThinkPad P1/X1 Extreme and 2 externals monitors connected to ThinkPad Thunderbolt 3 Dock

triple-head.sh

#!/usr/bin/env bash

SCREENS=$(xrandr --query | grep connected | grep -v disconnected | cut -d' ' -f1)
INTERNAL=$(echo ${SCREENS} | grep eDP-1-1)
RET=$?
if [ ${RET} -eq 0 ]; then
  echo "Internal panel detected."
  xrandr --output eDP-1-1 --auto
  exit
fi

TRIPLEHEAD=$(echo ${SCREENS} | grep DP-2 | grep DP-1.2 | grep DP-1.3)
RET=$?
# Force to single screen if "single" was passed.
if [ "${1}" == "single" ]; then
  RET=1
fi

if [ ${RET} -eq 0 ]; then
  gsettings set org.mate.interface window-scaling-factor 1
  gsettings set org.mate.interface window-scaling-factor-qt-sync true
  gsettings set org.gnome.desktop.interface scaling-factor 1
  sleep 1
  gsettings set x.dm.slick-greeter enable-hidpi 'off'
  xrandr --output DP-1.2 --mode 2560x1440 --primary \
         --output DP-1.3 --mode 2560x1440 \
         --output DP-2 --mode 3840x2160 --pos 1600x1440
  xrandr --output DP-2 --scale 0.5x0.5
  mate-tweak --layout Triplehead-tweak
else
  gsettings set org.mate.interface window-scaling-factor 2
  gsettings set org.gnome.desktop.interface scaling-factor 2
  gsettings set org.mate.interface window-scaling-factor-qt-sync true
  sleep 1
  gsettings set org.mate.interface window-scaling-factor 0
  gsettings set org.gnome.desktop.interface scaling-factor 0
  gsettings set x.dm.slick-greeter enable-hidpi 'auto'

  xrandr --output DP-1.2 --off \
         --output DP-1.3 --off \
         --output DP-2 --mode 3840x2160 --primary
  mate-tweak --layout P1-tweak
fi