https://bugs.kde.org/show_bug.cgi?id=516645
Bug ID: 516645
Summary: Snap overlay artifact on Wayland, only renders where
window has touched, not full overlay
Classification: Plasma
Product: kwin
Version First 6.6.0
Reported In:
Platform: CachyOS
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Quick Tiling
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 190048
--> https://bugs.kde.org/attachment.cgi?id=190048&action=edit
Video of me moving a window while shift is held down to snap it the artifact is
shown on the left side of the monitor.
SUMMARY
Snap overlay artifact on Wayland — preview only renders where window has
physically moved, not the full overlay area
STEPS TO REPRODUCE
On a Wayland session with an NVIDIA GPU, grab a window and begin dragging it
toward a screen edge
Move it to trigger the snap preview overlay
Jostle the window around near the screen edge repeatedly
OBSERVED RESULT
The snap preview overlay only renders in regions where the window has
physically passed over, as if the window is "painting" the overlay as it moves.
The rest of the overlay remains invisible. The artifact does not appear in
screenshots only visible directly on screen. It is motion-dependent and more
likely to appear with fast/aggressive movement.
EXPECTED RESULT
The full snap target area overlay should appear immediately and completely when
the window approaches the snap zone.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: CachyOS Linux (Arch-based)
KDE Plasma Version: 6.6.0
KDE Frameworks Version: 6.23.0
Qt Version: 6.10.2
Kernel Version: 6.19.3-2-cachyos (64-bit)
ADDITIONAL INFORMATION
GPU: NVIDIA GeForce RTX 5090
Driver: 590.48.01
Graphics Platform: Wayland (DRM backend, auto-detected)
CPU: AMD Ryzen 7 9800X3D
RAM: 64 GiB
Relevant journal errors at time of issue: Could not delete framebuffer because
no context is current, Could not delete texture because no context is current,
Could not delete render time query because no context is current
Tried KWIN_DRM_NO_AMS=1 and KWIN_EXPLICIT_SYNC=0 — neither resolved the issue
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