Comment # 1 on bug 1191346 from Stefan Dirsch

Hmm. What do you mean with "mDP"?

Wayland/Plasma support with NVIDIA is rather new and I'm wondering that Optimus
systems (Intel/NVIDIA combos) work at all with Wayland. I'm afraid you're
expecting too much here. I haven't tried it yet, but I guess if it works you
don't need suse-prime for Wayland any longer.

For the DPI issue I believe NVIDIA driver tries to do some clever approach for
the different DPIs of internal and external monitor, which you apparently don't
like. Please check NVIDIA's README for DPI and UseEdidDpi options to overcome
this.