https://bugs.kde.org/show_bug.cgi?id=407784
Bug ID: 407784
Summary: 3D Accelerated windows stop refreshing.
Product: kwin
Version: 5.15.90
Platform: Kubuntu Packages
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: razangriff-ra...@tutanota.com
Target Milestone: ---
SUMMARY
When updating to kwin 5.15.90, certain windows like Chromium, Atom, Godot
Engine and other windows that are 3D accelerated stop refreshing entirely.
The window needs to force a refresh by doing something like switching desktops,
resizing or minimizing-then-maximizing the window.
Shutting kwin_x11 down also makes the window refresh again, normally.
Going back to 5.15.5 makes everything work as normal as well.
Whenever it happens is not entirely clear but it seems to have something to do
with windows taking focus, for example Atom asking for github credentials, or
Godot starting a project. Switching windows can also trigger it but not always,
it's not entirely reliable, what makes it more disruptive because it seems it's
fixed but then it strikes.
STEPS TO REPRODUCE
1. Open a 3D accelerated window (Chromium, Godot, Discord, possibly others)
2. Switch focus away or spawn other windows.
3. Eventually display will stop refreshing.
OBSERVED RESULT
Window will stop updating. It's still working (trying to scroll will scroll,
sound is emitted, popups appear, but image is completely frozen for that
window.
EXPECTED RESULT
Window should just update normally.
SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Plasma: Ubuntu 19.04 amd64
(available in About System)
KDE Plasma Version: 5.15.90
KDE Frameworks Version: 5.15.90
Qt Version: 5.12.2
ADDITIONAL INFORMATION
Video card: GeForce GT 710.
OpenGL version: 4.6.0 NVIDIA 430.14
GL kernel module: nvidia
Running non-composited kwin-x11.
Reverting to 5.15.5 stops the issue, this is ONLY on 5.15.90.
This only seems to happen in 3D accelerated windows. Doing something like
disabling 3D acceleration on Chromium or Discord makes it not be affected by
this bug anymore. Other applications like konsole, krusader, quiteRSS and such
seem to never freeze. If enabling info display in nvidia-settings, only the
windows that have a display are affected, so I'm fairly sure it only affects 3D
windows.
I run my desktop with compositing disabled, but enabling it didn't seem to make
a difference, it still freezes windows at random. Note that enabling or
disabling compositing will force a redraw, but doesn't prevent windows from
freezing randomly again. I tried OpenGL 2.0, 3.0 and XRender backends, none of
them fix the issue. I also tried messing with vsync in both compositing and
nvidia settings. Nothing I tried seemed to stop the issue from happening at
inconvenient times.
Because of this, it's extremely disruptive of any workflow. Specially when
something might have changed the state of the window and resulting in clicking
into wherever the mouse pointer happens to land in a window that seems fine but
is actually not refreshing. Please help.
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