https://bugs.kde.org/show_bug.cgi?id=455594
Bug ID: 455594
Summary: On Nvidia X11, snapping/unsnapping/unmaximizing
Firefox causes screen to flicker
Product: kwin
Version: 5.25.0
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: nyanpas...@tuta.io
Target Milestone: ---
SUMMARY
When unmaximizing Firefox, the screen to the bottom and right of the window's
new position flickers until I unfocus Firefox, and afterwards the corners still
render oddly.
STEPS TO REPRODUCE
1. Start KDE X11.
2. Open and maximize Firefox.
3. Unmaximize it by clicking the title bar button.
(Alternatively press Super+arrow to snap it to the left or right of the screen,
which triggers flickering. Then click to another window and back to Firefox,
and press Super+the same arrow again, which will flicker for a moment.)
OBSERVED RESULT
The screen below and to the right of Firefox (x-right >= firefox.left, y-down
>= firefox.top) begins to flicker between the shadow drawn over the correct
underlying windows, and the shadow drawn over Firefox's old maximized contents.
EXPECTED RESULT
KWin with compositing on does not flicker.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.25.0
KDE Frameworks Version: 5.95.0
Qt Version: 5.15.4
Kernel Version: 5.18.3-zen1-1-zen (64-bit)
Graphics Platform: X11
Processors: 12 × AMD Ryzen 5 5600X 6-Core Processor
Memory: 15.5 GiB of RAM
Graphics Processor: NVIDIA GeForce GT 730/PCIe/SSE2
Manufacturer: Gigabyte Technology Co., Ltd.
Product Name: B550M DS3H
ADDITIONAL INFORMATION
This bug was discovered on system title-bar Firefox, but also occurs to an
extent on custom title-bar CSD Firefox. I could not test on Wayland because I'm
on an old GPU no longer receiving driver updates.
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