[ripdog]

I have a 4k monitor and a 1080p monitor connected to my Win10 desktop I'm typing this from. The DPI scaling works pretty damn well, apps switch DPI settings the instant they pass the boundary between the monitors. Sure, sometimes it breaks when games etc change the resolution on the 4k monitor, causing a window to be unscaled on the 4k monitor, but that's fixed simply by moving the window to the 1080p screen and back.

What trouble did you have? It's pretty great for me.

[eropple]

Controls jumping around when they windows between displays. Windows spawning on the laptop and not rescaling when brought to the low-DPI displays. It's just a stack of problems.