Bug 430771 - Turning off monitor in Wayland session causes strange fonts and missing icons on the panel
Summary: Turning off monitor in Wayland session causes strange fonts and missing icons...
Status: RESOLVED FIXED
Alias: None
Product: kwin
Classification: Plasma
Component: wayland-generic (other bugs)
Version First Reported In: 5.20.4
Platform: Manjaro Linux
: NOR normal
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2020-12-24 05:12 UTC by Joel H.
Modified: 2022-03-16 01:58 UTC (History)
2 users (show)

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:

Attachments
Screen shot with panel and start menu visible. Info collection program in background. (410.76 KB, image/png)
2020-12-24 05:12 UTC, Joel H. 		Details
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Description Joel H. 2020-12-24 05:12:52 UTC 
Created attachment 134302 [details]
Screen shot with panel and start menu visible. Info collection program in background.

I have a fairly low powered desktop connected to a TV screen via HDMI. When turning the monitor off/on while using Plasma on Wayland it causes some strange fonts and missing icons on the panel. Any other opened program doesn't seem affected.


STEPS TO REPRODUCE
1. Plasma (Wayland Session)
2. Turn off TV/Monitor
3. Panel icons missing and fonts rendering incorrectly. No other software affected.

EXPECTED RESULT
The panel used to have applications favourites and a status panel, those icons are now invisible. Font and icons not rendering on start menu.

SOFTWARE/OS VERSIONS
Manjaro KDE
KDE PLASMA: 5.20.4
FRAMEWORKS: 5.76.0
QT: 5.15.2
AMD Athlon 200GE with Radeon Vega 3 Graphics
Wayland
Comment 1 Joel H. 2020-12-30 01:05:45 UTC 
Just did a bit more detective work. It appears that after the display gets turned off and on, plasmashell's CPU usage goes to 100% in htop. It also appears that any opened application will also have 100% CPU usage.
Comment 2 Joel H. 2020-12-30 01:18:10 UTC 
I am not able to reproduce the 100% CPU issue on a live USB, but the fonts still display like they do in the screenshot.
Comment 3 Vlad Zahorodnii 2021-01-05 08:22:51 UTC 
It looks like a Qt or plasma bug.
Comment 4 Joel H. 2021-03-02 06:50:05 UTC 
Hi thought i'd give an update:

- KDE Plasma 5.21 doesn't appear to fix this issue.
- This issue only seems to happen on the APU of the AMD Athlon 200GE, cannot reproduce on another AMD graphics card.
- Logging out and in or rebooting is the only way to temporarily fix the issue.
Comment 5 Joel H. 2022-03-16 01:58:42 UTC 
It seems like a Plasma update sometime in 2021 solved this issue