https://bugs.kde.org/show_bug.cgi?id=501314
Bug ID: 501314
Summary: Maximizing Chrome PWA windows may render without
window frame and offset contents
Classification: Plasma
Product: kwin
Version: 6.3.2
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: k...@kaishome.de
Target Milestone: ---
SUMMARY
Sometimes, when maximizing a Chrome window or dragging it from one monitor to
another, the window frame doesn't render properly and the contents of the
window are rendered by an offset the height of the frame. This most likely only
happens to Chrome windows in PWA mode. This seems to be an issue only with
wayland.
Usually, the problem is fixed most of the times by restoring and maximizing the
window via keyboard shortcuts at least twice. Sometimes it helps dragging the
window back to the previous monitor (via win+mouse), then moving it back to the
other monitor.
A similar behavior can be observed with OBS docks when undocking them, tho
usually, the contents of those docks do not render properly at all. So this is
probably unrelated or has a very different effect.
While Chrome (and OBS docks) render their own window decorations, and it may
thus be their fault, maybe there's a race condition in kwin? I couldn't
reproduce the rendering problems in X11 with Chrome, but I could reproduce the
rendering problems in X11 with OBS. I'm currently on Wayland. This bug report
is about Chrome, OBS is just a side note.
STEPS TO REPRODUCE
1. Make a window an PWA app using the Chrome tools menu
2. Drag the window to a different monitor and drag it to the top edge to
maximize, or open the PWA app from the Plasma menu and maximize it
3. Observe that (only sometimes) the window will render without border and
mouse hover effects and click positions are offset from where you click
4. The window frame is still there, just not rendered: you can click where you
expect the frame buttons to close or minimize the window
5. Restore/maximize multiple times to make the window render properly
OBSERVED RESULT
Maximized windows may render without a window frame but click positions inside
the window are offset by the size of the frame.
EXPECTED RESULT
The window frame should render properly, and window contents should render to
the correct position.
SOFTWARE/OS VERSIONS
Operating System: Gentoo Linux 2.17
KDE Plasma Version: 6.3.2
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2
Kernel Version: 6.12.18-gentoo (64-bit)
Graphics Platform: Wayland
Processors: 20 × 12th Gen Intel® Core™ i7-12700K
Memory: 31.1 GiB of RAM
Graphics Processor 1: NVIDIA GeForce RTX 3080 Ti
Graphics Processor 2: Intel® UHD Graphics 770
Manufacturer: ASRock
Product Name: Z690 Pro RS
NVIDIA-SMI 570.124.04
Driver Version: 570.124.04
CUDA Version: 12.8
ADDITIONAL INFORMATION
This looks like a race condition. It's unreliable to reproduce, and if it
happens, it may happen multiple times in a row with different Chrome windows.
I've rarely seen a full Chrome window with tabs render improperly, and I am
currently only able to reproduce the problem with PWA apps. This is on Wayland.
I've seen this on other systems with NVIDIA but not yet on a desktop with Intel
iGPU. So this may be specific to NVIDIA.
My NVIDIA driver is running with "nvidia-drm modeset=1 fbdev=1" because
otherwise I cannot properly run OBS recordings with obs-vkcapture.
chrome://flags/#ozone-platform-hint is set to "Default".
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