Yeah its weird. Definitely a bug, everyone’s who’s reported it have had the depreciated drivers like vesa. I remember using that back in like 2004 lol. same goes for fbdev. Just wondering if it got added in as a bum kernel option somehow.
Seems on par with gnome that fractional scaling is an issue ( most likely due to something using vesa or fbdev do not quote me on that - its a guestimation )
These two articles kind of outline what could be going on, Even as a native KDE user - if you install gnome and test this out does it alleviate any issues that he is currently experiencing ?