Pi Touch Screen: Here is how to invert

Danal

For those running this very popular touch screen on the D3 + Pi, you may need to mount it inverted to get the cables to route better. If so, these two changes will make both the display and the touch mouse work correctly:

To flip the display 180 degrees:

edit (sudo vi or sudo nano) /boot/config.txt and add a line at the bottom display_rotate=2

To reverse the mouse (both right left and up down as correct for the 180 flipped display):

cd /usr/share/X11/xorg.conf.d/
create a new file (sudo vi or sudo nano) 99-libinput.conf that contains:

Section "InputClass"
  Identifier "libinput touchscreen catchall"
  MatchDevicePath "/dev/input/event0"
  Driver "libinput"
  Option "TransformationMatrix" "-1 0 1 0 -1 1 0 0 1"
EndSection

Reboot and test. That's it.

P.S. There are a bunch of ways to convince X11 to reverse the mouse. The above is one of the most reliable.