https://bugs.kde.org/show_bug.cgi?id=456608
Bug ID: 456608
Summary: Window refresh randomly glitches out
Product: kwin
Version: 5.25.2
Platform: Neon Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: watisthis...@outlook.com
Target Milestone: ---
Created attachment 150549
--> https://bugs.kde.org/attachment.cgi?id=150549&action=edit
video
It's possible that this is some amdgpu driver glitch but since it started after
the 5.25 updates I think the problem could be in Kwin. (I installed the 5.25.0,
.1 and .2 updates all at pretty much same time so can't say which one)
Sometimes a window suddenly glitches and its contents refresh gets really slow
(like <1 fps) and glitchy.
So far this has happened to Firefox, Dolphin, Kwrite and Opera IIRC. Closing
and restarting the glitched app fixes the problem. It seems to happen like
almost once a day to some app so it's quite annoying.
Please see the attached video to see what it looks like.
Note how showing the window thumbnail from the panel behaves. The thumbnail
itself shows the window contents perfectly fine and smoothly. There is also the
large margin around the thumbnail popup which seems to be updating the
underlying window differently.
There are some kwin_x11 XCB errors in system logs around when the bug occurs; I
think they may be related. I haven't seen those in that large numbers before.
https://bugs.kde.org/show_bug.cgi?id=456511 could be related but in my case
apps never freeze completely.
Operating System: KDE neon 5.25
KDE Plasma Version: 5.25.2
KDE Frameworks Version: 5.95.0
Qt Version: 5.15.5
Kernel Version: 5.13.0-52-generic (64-bit)
Graphics Platform: X11
Graphics Processor: Radeon RX Vega 56
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