I have a laptop with HiDPI screen which is 15'6" and has resolution of 3200x1600px. Since HiDPI support in KDE is still WIP, i often rescale it to 1920x1080, though i need to do this either from console using xrandr or by usin nvidia-settings (i'm using properiaty drivers). Laptop's monitor reports only native resolution, so kscreen gives me no choice. It'd be cool if it could show also all the scaled resolutions, just like nvidia's properiaty tool does. There's no problem with nouveau, but let's just say that nouveau with this GPU also works like WIP to say at least. Reproducible: Always
Plasma and KDE applications should work correctly under HiDPI screens.