Bug 450568

Summary:	Plasma 5.24 backport causing blank black screen
Product:	[Plasma] Plasma SDK	Reporter:	ittome
Component:	General	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED DOWNSTREAM
Severity:	critical	CC:	amyekut, antonis.tsiapaliokas, behzad.a_ir, semen.vozhov, sitter
Priority:	NOR
Version First Reported In:	5.24.0
Target Milestone:	---
Platform:	Kubuntu
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description ittome 2022-02-19 13:38:37 UTC

SUMMARY
***
NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols.
See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports
***
upgraded to Kunbuntu 21.10, was running good for over a month, within the last couple days (possibly after an update in Discovery) the bottom desktop Panel disappeared, even after reboot. I was able to add a new one and set it up close to what I had. Next time I start up, it is missing again. I couldn't find any info on this searching. I did find info on upgrading Plasma to 5.24 through backports, I'm not sure what this is, but I installed it hoping it would help.
* Rebooted and now my screen is blank/black with only the mouse pointer. *
I got to this somehow by I believe Alt-tab opening up a process list, menu for tools, opened up Info (on system), nothing showed up, but I could click Report a Bug that opened a browser to enter this. I'm not sure how anyone can help as I don't have access to do anything on my computer which is a Dell tower, using HDMI output. I can get to Konsole.

STEPS TO REPRODUCE
1. install Plasma 5.24 backports
2. reboot
3.

OBSERVED RESULT
- blank black screen with mouse pointer, no clicking or right clicking do anything.

EXPECTED RESULT
- expected to get Panel back

SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Plasma: Kubuntu 21.10 * can't acces anything to get System Info *
(available in About System)
KDE Plasma Version: 5.24
KDE Frameworks Version:
Qt Version:

ADDITIONAL INFORMATION

Comment 1 ittome 2022-02-19 13:41:01 UTC

updated product to Plasma

Comment 2 ittome 2022-02-19 15:27:25 UTC

Upon reboot (again), a KWIN (stopped?) warning came up, under report a bug from the error window, I saw 'kwin 5.22.5 no longer supported'.

Before I tried to remove the backports to restore, 

I tried 'sudo pkcon update' which upon this next reboot, I can now see the desktop screen except for the original problem of no Panel.  

This still leaves the issue of the Panel disappearing on boot up.  I hope there is a fix so I will not need to add a Panel every time I boot up.

I hope this helps with correcting this bug, to maybe check for appropriate versions before it installs or to add the correct versions, if this is the issue.

Comment 3 Behzad A 2022-02-20 10:44:35 UTC

*** Bug 450585 has been marked as a duplicate of this bug. ***

Comment 4 Behzad A 2022-02-20 10:44:54 UTC

*** Bug 450586 has been marked as a duplicate of this bug. ***

Comment 5 Behzad A 2022-02-20 15:28:49 UTC

(Amnon from comment #3)
> There is a solution here:
> 
> https://www.kubuntuforums.net/forum/currently-supported-releases/kubuntu-21-10-impish-indri/desktop-environment-support-aa/660790-after-upgrade-to-plasma-5-24-system-is-broken#post660791

Comment 6 samvo 2022-02-22 19:51:03 UTC

(In reply to Behzad A from comment #5)
> (Amnon from comment #3)
> > There is a solution here:
> > 
> > https://www.kubuntuforums.net/forum/currently-supported-releases/kubuntu-21-10-impish-indri/desktop-environment-support-aa/660790-after-upgrade-to-plasma-5-24-system-is-broken#post660791

Same problem on KDE Neon. Solution fo kUbuntu not help