https://bugs.kde.org/show_bug.cgi?id=469909
Bug ID: 469909
Summary: Broken scaling in Qt6 apps when display scale is set
to <100%
Classification: Plasma
Product: kwin
Version: 5.27.5
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: n.makaro...@gmail.com
Target Milestone: ---
Created attachment 159043
--> https://bugs.kde.org/attachment.cgi?id=159043&action=edit
Comparison between Strawberry (Qt6 app) and Picard (Qt5 app)
SUMMARY
In the Plasma Wayland session, setting the display scale factor to less than
100% causes several issues with Qt6 apps, making them unusable: incorrect scale
of UI elements, flickering, items disappearing, among others. Scaling factors
above 100% show no such issues - apps are functioning normally.
I've tried Strawberry Music Player, Audacious, qBittorrent and qt6ct - all of
them exhibit similar problems. Qt5 apps are unaffected (see attachments).
STEPS TO REPRODUCE
1. Set display scale factor to any value below 100%
2. Launch a Qt6 app
OBSERVED RESULT
App launches normally; icon, text, interface scale is abnormal; several UI
elements non-interactable; UI elements flickering and disappearing.
EXPECTED RESULT
A normally-functioning app.
SOFTWARE/OS VERSIONS
Linux Kernel: 6.3.2-arch1-1
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.108.0
Qt Version: 5.15.9
ADDITIONAL INFORMATION
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