https://bugs.kde.org/show_bug.cgi?id=520023
Bug ID: 520023
Summary: QtWidgets apps render a black screen when maximised/at
certain geometries
Classification: Plasma
Product: kwin
Version First master
Reported In:
Platform: KDE Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
DESCRIPTION
When apps using QtWidgets are maximised, they render with a black screen.
Certain apps also render with black screens at specific geometries, i.e. when
changing their size, they flicker black. The window decoration renders
correctly.
STEPS TO REPRODUCE
1. Maximise a window of a QtWidgets application - i.e. Dolphin, Konsole
2. Or, slowly resize their window from any direction.
3. Black windows will become visible.
OBSERVED RESULT
Windows render with black screens when maximised, and at certain geometries.
EXPECTED RESULT
Windows render normally with all geometries.
SOFTWARE/OS VERSIONS
Operating System: KDE Linux 2026-05-08
KDE Plasma Version: 6.6.80
KDE Frameworks Version: 6.27.0
Qt Version: 6.11.0
Kernel Version: 7.0.3-arch1-2 (64-bit)
Graphics Platform: Wayland
Processors: 20 × 13th Gen Intel® Core™ i5-13600K
Memory: 32 GiB of RAM (31.1 GiB usable)
Graphics Processor 1: NVIDIA GeForce RTX 2080 Ti
Graphics Processor 2: Intel® Graphics
ADDITIONAL INFORMATION
Might be something to do with me using an NVIDIA card? And/or recent changes
with https://zamundaaa.github.io/wayland/2026/05/06/making-wl-shm-fast.html
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