Lenovo ThinkPad P40 Yoga

Install . Under GNOME, rotation will happen automatically. Under i3, you can use this script in the background:

#!/bin/sh
# Requires https://github.com/hadess/iio-sensor-proxy

dbus-monitor --system interface=org.freedesktop.DBus.Properties,member=PropertiesChanged,path=/net/hadess/SensorProxy 2> /dev/null |
        sed -n -u -e '/string "AccelerometerOrientation"/ {n ; s/\s*variant\s*string\s*"\(.*\)"/\1/p}' |
        while read -r line ; do
                case $line in
                        right-up )
                                xrandr -o right &> /dev/null
                                ;;
                        left-up )
                                xrandr -o left &> /dev/null 
                                ;;
                        bottom-up )
                                xrandr -o inverted &> /dev/null
                                ;;
                        normal | * )
                                xrandr -o normal &> /dev/null
                                ;;
                 esac
        done

In order to have your touchpad, Trackpoint, touchscreen and stylus also change orientation, install xrandr-align and run the following script at startup: