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I'm really surprised by this - I use Arch (btw) with KDE Plasma (5 and 6) and I've been using 150% on a 4K monitor for a long time and it has worked very well. Modern Qt apps work fine, browsers too.

I find the GTK side of things a lot flakier, though.

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Same here, using KDE Plasma + Wayland on openSUSE Tumbleweed and AMD GPU and have no problems with 3 monitors all set to different fractional DPIs. No complaints for a long time. But yeah had lots of problems in GNOME or other GTK desktops. Not just with fractional DPI but by multi-monitor support in general.

I had trouble with it, but when Ubuntu Wayland support appeared it pretty much solved the problem. Curious as to whether the parent post tried before or after that switch over. Prior to Ubuntu+Wayland it really was unusably bad with mixed screen resolutions for me.

Ah, I find mixed DPI/resolutions is a disaster on Windows too - apps break when moved between monitors quite a lot.

The trick for me was going all in - 4K monitors at 150% only on both Windows and Linux - on Mac I have a 4K portrait and a 5K landscape, and that works fine there.

I've been using 150% on both X11 (since late 2021/early 2022) and Wayland on AMD hardware and it's been pretty much fine.

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