Bug 485263

Summary:	Panel on one screen occasionally lost
Product:	[Plasma] plasmashell	Reporter:	Cristian Le <kde>
Component:	Panel	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED WORKSFORME
Severity:	normal	CC:	kdedev, nate, niccolo.venerandi, plasma-bugs-null
Priority:	NOR	Keywords:	multiscreen
Version First Reported In:	6.0.3
Target Milestone:	1.0
Platform:	Fedora RPMs
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Cristian Le 2024-04-09 08:03:09 UTC

SUMMARY

Occasionally the task-manager is lost. On another screen, the panel seems to be unaffected. I can't tell exactly what causes this issue and it is not easily reproducible. More often it seem to happen when there is a high load on the machine.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora40
KDE Plasma Version: 6.0.3
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2

Comment 1 Nate Graham 2024-04-09 14:50:34 UTC

So you have multiple screens, and each one of them has a Panel, and sometimes, the panel on oe of the screens *disappears* entirely? Is that right? Or is something else happening?

Can you try to do some self-debugging and figure out what event might be causing it? For example, logging in, locking the screen, letting any monitors go into powersave mode, re-arranging screens, unplugging or re-plugging a screen, etc.

Comment 2 Cristian Le 2024-04-09 15:01:48 UTC

(In reply to Nate Graham from comment #1)
> So you have multiple screens, and each one of them has a Panel, and
> sometimes, the panel on oe of the screens *disappears* entirely? Is that
> right?

Exactly right, it appears like some component crashes, and sometimes it happens on only one Panel which is the odd thing.

> Can you try to do some self-debugging and figure out what event might be
> causing it? For example, logging in, locking the screen, letting any
> monitors go into powersave mode, re-arranging screens, unplugging or
> re-plugging a screen, etc.

That Is the issue, I regularly do these tasks and it is not readily reproduced. The only clue I have is that it doesn't happen when the computer is idle, so after it recovers and I want to reproduce it fails to break again (plus I would need to log-out and log-in to recover the panels, unless there is a more convenient command to do so?).

Another clue is that this happens when the monitor layout is idle, i.e. no screenlock, no powersave, no screen unplug etc. Sometimes a (non-KDE, usually IntelliJ or Firefox) program crashes and it takes the Panel with it.

Comment 3 TraceyC 2024-04-09 21:26:28 UTC

Hi,

I have seen Firefox crash and Plasma be affected on my machine, but it was with Wayland. I have never seen this with X11. Are you using a Wayland or X11 session when this bug occurs?

Comment 4 TraceyC 2024-08-14 15:41:24 UTC

Please let us know if you are logged into an X11 or Wayland session when the panel disappears / you see a crash.

You can restart plasmashell without having to re-login with this

systemctl restart --user plasma-plasmashell.service

Comment 5 Cristian Le 2024-08-14 15:53:02 UTC

Sorry for the late reply, it was on wayland. Lately though I didn't find this issue to occur anymore.

Comment 6 TraceyC 2024-08-14 16:10:11 UTC

Thanks for following up. Glad to hear it's not a problem for you anymore.

I'm setting this to resolved for now. If the problem happens on your system again, feel free to reopen this report.