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Touchpad need to be rotated too in order to work correctly according to the screen. The device 'ASUS HID Device ASUS HID Device Touchpad' has transformation matrix property available through xinput command.
It was working badly originally on Linux (by default screen has a portrait orientation, but touchpad hasn't). But it could be easily fixed by this script.

fix:

1. new variable
   DEVICE2="ASUS HID Device ASUS HID Device Touchpad" # touchpad
2. new transormation case:
   case "$2" in normal) [ ! -z "$DEVICE0" ] && xinput set-prop "$DEVICE0" "$TRANSFORM" 1 0 0 0 1 0 0 0 1 [ ! -z "$DEVICE1" ] && xinput set-prop "$DEVICE1" "$TRANSFORM" 1 0 0 0 1 0 0 0 1 [ ! -z "$DEVICE2" ] && xinput set-prop "$DEVICE2" "$TRANSFORM" 0 -1 1 1 0 0 0 0 1 ;; inverted) [ ! -z "$DEVICE0" ] && xinput set-prop "$DEVICE0" "$TRANSFORM" -1 0 1 0 -1 1 0 0 1 [ ! -z "$DEVICE1" ] && xinput set-prop "$DEVICE1" "$TRANSFORM" -1 0 1 0 -1 1 0 0 1 [ ! -z "$DEVICE2" ] && xinput set-prop "$DEVICE2" "$TRANSFORM" 0 1 0 -1 0 1 0 0 1 ;; left) [ ! -z "$DEVICE0" ] && xinput set-prop "$DEVICE0" "$TRANSFORM" 0 -1 1 1 0 0 0 0 1 [ ! -z "$DEVICE1" ] && xinput set-prop "$DEVICE1" "$TRANSFORM" 0 -1 1 1 0 0 0 0 1 [ ! -z "$DEVICE2" ] && xinput set-prop "$DEVICE2" "$TRANSFORM" -1 0 1 0 -1 1 0 0 1 ;; right) [ ! -z "$DEVICE0" ] && xinput set-prop "$DEVICE0" "$TRANSFORM" 0 1 0 -1 0 1 0 0 1 [ ! -z "$DEVICE1" ] && xinput set-prop "$DEVICE1" "$TRANSFORM" 0 1 0 -1 0 1 0 0 1 [ ! -z "$DEVICE2" ] && xinput set-prop "$DEVICE2" "$TRANSFORM" 1 0 0 0 1 0 0 0 1 ;; esac

I have an Asus T102HA and the pen device name (id) differs from the one that is in the script.
$ uname -a Linux T102 4.19.24-1-MANJARO #1 SMP PREEMPT Wed Feb 20 22:59:23 UTC 2019 x86_64 GNU/Linux

fix:
DEVICE1="ELAN22A6:00 04F3:22A6 Pen Pen (0)"