Bug 464120

Summary:	Plasma sometimes becomes unresponsive when desktop is unfocused
Product:	[Plasma] plasmashell	Reporter:	gudvinr+kde
Component:	generic-performance	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED UPSTREAM
Severity:	normal	CC:	kde, nate
Priority:	NOR
Version First Reported In:	5.26.5
Target Milestone:	1.0
Platform:	Arch Linux
OS:	Linux
URL:	https://gitlab.freedesktop.org/mesa/mesa/-/issues/7624
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	events for plasma and kwin

Description gudvinr+kde 2023-01-10 21:53:31 UTC

SUMMARY

When I use desktop, quite often I find myself in a situation when notifications aren't going away after a while.
Not permanent notifications, regular ones, like mouse low power notification.
They do have blue progress ring but it doesn't move.

Then, after some time I made an observation that once you move mouse cursor over desktop, it starts progressing but until you stop jiggling mouse.

When you move mouse over window it stops progressing again.

Also when this bug can be observed, global shortcuts (like Win key that should open app menu) doesn't work too.

However, I wasn't able to find anything that explicitly triggers this behaviour so I can't give steps to reproduce. I only notice this when I am able to see bugged notifications or shortcuts not being executed.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.26.5
KDE Frameworks Version: 5.101.0
Qt Version: 5.15.8
Kernel Version: 6.1.4-zen2-1-zen (64-bit)
Graphics Platform: Wayland

Comment 1 gudvinr+kde 2023-01-10 22:06:01 UTC

Created attachment 155192 [details]
events for plasma and kwin

Adding a bit of logs from before this issue happening but I am not sure how useful this information is

Comment 2 Nate Graham 2023-01-11 19:06:02 UTC

Let me guess, you have an AMD GPU?

Comment 3 gudvinr+kde 2023-01-11 19:09:20 UTC

Yes I do.

Graphics Processor: AMD Radeon RX Vega M GL Graphics

Comment 4 Nate Graham 2023-01-11 19:13:44 UTC

I had a feeling. This was caused by a recent regression in the AMD graphics drivers which has thankfully already been fixed. See https://gitlab.freedesktop.org/mesa/mesa/-/issues/7624.

Comment 5 gudvinr+kde 2023-01-11 19:30:03 UTC

Issue seem to be fixed by disabling opengl threading for plasmashell process.

Similar workaround is implemented for kwin (https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19147). It vaguely says "cursor issues".

But just out of curiosity, if workaround is needed, is it really fixed? What's the root cause? Is it improper threading in plasmashell or driver misbehaving?

It might not be an issue with Intel because as they say in this thread:
> AFAIK the drivers for Intel GPUs don't enable glthread by default yet, you'd have to explicitly enable it with mesa_glthread=true