[Majestic121]

I think your information about High DPI support with Linux is outdated. I've been using a 4k screen with Ubuntu for more than a year now without any particular issue.

[jnwatson]

The latest Gnome/Ubuntu does not support dual monitor where only 1 monitor is hidpi.

[jhoechtl]

Under Wayland with fractional scaling enabled you get per monitor DPI scaling. It works, but has issues when you detach the external monitor / undock.