This script rotates the screen and touchscreen input, disables or enbles the touchpad, and dis- or enables the virtual keyboard on a Lenovo Yoga 13 or Yoga 2 Pro (source: http://askubuntu.com/q/405628/34298)

rotate-screen.sh

#!/bin/bash
# This script rotates the screen and touchscreen input 90 degrees each time it is called, 
# also disables the touchpad, and enables the virtual keyboard accordingly

# by Ruben Barkow: https://gist.github.com/rubo77/daa262e0229f6e398766

#### configuration
# find your Touchscreen and Touchpad device with `xinput`
TouchscreenDevice='ELAN Touchscreen'
TouchpadDevice='SynPS/2 Synaptics TouchPad'

if [ "$1" = "--help"  ] || [ "$1" = "-h"  ] ; then
echo 'Usage: rotate-screen.sh [OPTION]'
echo
echo 'This script rotates the screen and touchscreen input 90 degrees each time it is called,' 
echo 'also disables the touchpad, and enables the virtual keyboard accordingly'
echo
echo Usage:
echo ' -h --help display this help'
echo ' -j (just horizontal) rotates the screen and touchscreen input only 180 degrees'
echo ' -n always rotates the screen back to normal'
exit 0
fi

touchpadEnabled=$(xinput --list-props "$TouchpadDevice" | awk '/Device Enabled/{print $NF}')
screenMatrix=$(xinput --list-props "$TouchscreenDevice" | awk '/Coordinate Transformation Matrix/{print $5$6$7$8$9$10$11$12$NF}')

# Matrix for rotation
# ⎡ 1 0 0 ⎤
# ⎜ 0 1 0 ⎥
# ⎣ 0 0 1 ⎦
normal='1 0 0 0 1 0 0 0 1'
normal_float='1.000000,0.000000,0.000000,0.000000,1.000000,0.000000,0.000000,0.000000,1.000000'

#⎡ -1  0 1 ⎤
#⎜  0 -1 1 ⎥
#⎣  0  0 1 ⎦
inverted='-1 0 1 0 -1 1 0 0 1'
inverted_float='-1.000000,0.000000,1.000000,0.000000,-1.000000,1.000000,0.000000,0.000000,1.000000'

# 90° to the left 
# ⎡ 0 -1 1 ⎤
# ⎜ 1  0 0 ⎥
# ⎣ 0  0 1 ⎦
left='0 -1 1 1 0 0 0 0 1'
left_float='0.000000,-1.000000,1.000000,1.000000,0.000000,0.000000,0.000000,0.000000,1.000000'

# 90° to the right
#⎡  0 1 0 ⎤
#⎜ -1 0 1 ⎥
#⎣  0 0 1 ⎦
right='0 1 0 -1 0 1 0 0 1'

if [ $screenMatrix == $normal_float ] && [ "$1" != "-n" ]
then
  echo "Upside down"
  xrandr -o inverted
  xinput set-prop "$TouchscreenDevice" 'Coordinate Transformation Matrix' $inverted
  xinput disable "$TouchpadDevice"
  # Remove hashtag below if you want pop-up the virtual keyboard  
  #onboard &
elif [ $screenMatrix == $inverted_float ] && [ "$1" != "-j" ] && [ "$1" != "-n" ]
then
  echo "90° to the left"
  xrandr -o left
  xinput set-prop "$TouchscreenDevice" 'Coordinate Transformation Matrix' $left
  xinput disable "$TouchpadDevice"
  #killall onboard
elif [ $screenMatrix == $left_float ] && [ "$1" != "-j" ] && [ "$1" != "-n" ]
then
  echo "90° to the right"
  xrandr -o right
  xinput set-prop "$TouchscreenDevice" 'Coordinate Transformation Matrix' $right
  xinput disable "$TouchpadDevice"
  #killall onboard
else
  echo "Back to normal"
  xrandr -o normal
  xinput set-prop "$TouchscreenDevice" 'Coordinate Transformation Matrix' $normal
  xinput enable "$TouchpadDevice"
  #killall onboard
fi

What do I need to change in the code to change to monitor instead of the Laptop builtin display?

look at line 8: you have to change line 9 to match the screen, you want to rotate

why does xinput show no touchscreen devices? I can see it is working although 90 degrees off after xrandr -o left ... ASUS T100HA mini-transformer Manjaro Linux Release: 21.1.6

Hi, Thank's alot for writing this script! It works on my Dell XPS-18 .I use 'USBest Technology SiS HID Touch Controller touch'