https://bugs.kde.org/show_bug.cgi?id=521880
Bug ID: 521880
Summary: Secondary monitor has severe ghosting/artifacts and
window thumbnails stop updating after upgrading from
Plasma 6.6.5 to 6.7.0. The issue only occurs when the
monitor is rotated to 270°.
Classification: Plasma
Product: kwin
Version First unspecified
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: multi-screen
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Environment
Plasma: 6.7.0
KWin: 6.7.0
Session: Wayland
GPU:
AMD Radeon 780M (Ryzen 9 7845HX iGPU)
NVIDIA RTX 4060 Laptop GPU
NVIDIA Driver: nvidia-open-dkms 610.43.02
Mesa: 26.1.3
Distribution: EndeavourOS (Arch-based)
Steps to Reproduce
Boot into Plasma Wayland.
Connect a secondary monitor.
Rotate the secondary monitor to 270° (portrait, clockwise).
Move windows on the secondary monitor.
Actual Results
Severe ghosting / trailing artifacts appear while moving windows.
Window thumbnails/previews stop updating in the taskbar.
Desktop animations become abnormal.
The issue only occurs at 270° rotation.
0°, 90° and 180° rotations work normally.
Expected Results
The secondary monitor should render normally at 270° rotation without ghosting
or broken previews.
Additional Information
The issue did not exist on Plasma 6.6.5.
After upgrading to Plasma 6.7.0 the issue appears immediately.
Restoring a system snapshot back to Plasma 6.6.5 makes the issue disappear
completely.
The behavior is reproducible:
6.6.5 -> works
6.7.0 -> broken
rollback to 6.6.5 -> works again
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