Comment 2 for bug 1846398

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Daniel van Vugt (vanvugt) wrote : Re: Fractional scaling has significant visible refreshes on a 4k display

I can't yet tell which issue this is, but it sounds likely to be one of
https://discourse.ubuntu.com/t/x11-hidpi-scaling-available-for-testing-on-disco/10293/3

If you need a fractional scale value then you should find the implementation for Wayland sessions performs better and is more complete. Because it doesn't have to deal with legacy Xorg.

If you need Xorg then using whole scale values (n * 100%) works better as you mentioned, because it avoids the Xorg fractional scaling path.