I didn't get any HDMI settings to work when I tried in Tumbleweed for Raspi (2 or 3, don't remember). It's a pain. Only workaround I found:

- Add a non-root user
- Install tigervnc (cookbook here, adapt directories in the systemd script to your new, non-root user)


- Use your raspi headless and have a free-scalable desktop that works (in TW, at least ;-) ).

Have fun!