Bug 434385

Summary:	Taskbar freezes regularly when Compositor is set to XRender
Product:	[Plasma] plasmashell	Reporter:	Marc <esmb>
Component:	general	Assignee:	David Edmundson <kde>
Status:	RESOLVED WORKSFORME
Severity:	critical	CC:	plasma-bugs-null
Priority:	NOR
Version First Reported In:	5.21.1
Target Milestone:	1.0
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	attachment-28838-0.html

Description Marc 2021-03-14 07:32:16 UTC

SUMMARY
When the compositor is set to XRender, the taskbar freezes regularly and the system becomes unusable because of that. I have to reboot or restart the plasmashell to get it back working.

The bug occurs after some time of usage. Sometimes after a couple of minutes, sometimes after a few hours. But it occurs multiple times a day and made me switch to Gnome for a while (I had this bug for at least year). While searching in forums, I found quite a number of people having a freezing taskbar problem. Only recently I noticed that this is dependent on the compositor backend.

There is another bug report which mentions the compositor backends, but for me it's exactly the other way around as in Bug 425557. Both OpenGL backends do not seem to trigger the bug on my system (ThinkPad with Intel Graphics)

I need to use XRender though because of another bug. Screencasts or TeamViewer/Anydesk sessions with the OpenGL backends result in flickering, where the desktop background behind a window appears in some frames.

STEPS TO REPRODUCE
1. Just run plasma with XRender backend and work till the taskbar freezes

OBSERVED RESULT
The taskbar freezes completely and cannot be unfrozen. I need to restart the plasmashell.

EXPECTED RESULT
Not freezing ;-)

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux
KDE Plasma Version: 5.21.1 
KDE Frameworks Version: 5.79.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION

Comment 1 David Edmundson 2021-03-14 12:53:57 UTC

When frozen can you right click on the dekstop and get a context menu?

Comment 2 Marc 2021-03-15 15:40:51 UTC

Created attachment 136697 [details]
attachment-28838-0.html

No, the plasma shell seems to be completely frozen. No context menu and no krunner. But curiously KWin seems to still work fine. So I can continue working with existing application windows and even use ALT-Tab. That's why I often realize that Plasma is frozen after a couple of minutes.

I have tried to track the issue down, but I was not able to find anything obvious in the logs.

Thank you very much for looking into the issue.

Get Outlook for Android<https://aka.ms/AAb9ysg>

________________________________
From: David Edmundson <bugzilla_noreply@kde.org>
Sent: Sunday, March 14, 2021 1:53:57 PM
To: esmb@hotmail.de <esmb@hotmail.de>
Subject: [plasmashell] [Bug 434385] Taskbar freezes regularly when Compositor is set to XRender

https://bugs.kde.org/show_bug.cgi?id=434385

David Edmundson <kde@davidedmundson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |WAITINGFORINFO
             Status|REPORTED                    |NEEDSINFO

--- Comment #1 from David Edmundson <kde@davidedmundson.co.uk> ---
When frozen can you right click on the dekstop and get a context menu?

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Comment 3 Bug Janitor Service 2021-03-30 04:33:35 UTC

Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

If you have already provided the requested information, please
mark the bug as REPORTED so that the KDE team knows that the bug is
ready to be confirmed.

Thank you for helping us make KDE software even better for everyone!

Comment 4 Bug Janitor Service 2021-04-14 04:33:20 UTC

This bug has been in NEEDSINFO status with no change for at least
30 days. The bug is now closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

Thank you for helping us make KDE software even better for everyone!