https://bugs.kde.org/show_bug.cgi?id=502187
Bug ID: 502187
Summary: KDE + Wayland global/system scaling system breaks
applications ability to read monitors resolution.
Classification: Plasma
Product: kwin
Version: unspecified
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: jtchristian1...@pm.me
Target Milestone: ---
Created attachment 179851
--> https://bugs.kde.org/attachment.cgi?id=179851&action=edit
hardware information report
SUMMARY
Changing scaling from 100% to anything else in Wayland will cause games (and
possibly other 3d application?) to not be able to recognize the resolution of
the monitor. For example setting scale to 180% will cause games to think the
monitors resolution is 1280x1024 in Final Fantasy XIV. I've tried many games
and they all react exactly the same, the only solution is to set scaling to
100% (default) BEFORE launching a game.. but this means i need to basically
stick my face right in front of my 4k monitor to be able to see anything just
so i can launch a game, then when im done playing the game set it back to
preferred scale.
on advice from the RebornOS discord team, i tried switching to X11 display
compositor and set the global scale to 180 and 200% and both options had no
effect on an applications ability to read the monitors proper resolution.
Appears to be a problem with KDE and Wayland specifically.
in display configuration changed system scales or applications scales has zero
effect on this problem. unfortunately switching back to X11 is not an option
because it has no adaptive sync support.
STEPS TO REPRODUCE
1. System Settings
2. Display Configuration
3. Change 'Scale' to any number than 100%
4. Launch game (or possibly other 3d application) and attempt to change
resolution.
OBSERVED RESULT
EXPECTED RESULT
No effect by global/system scaling in applications such as game rendering it
unable to read monitors resolution.
SOFTWARE/OS VERSIONS
see attached file.
ADDITIONAL INFORMATION
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