Bug 424322 - Switch user does not work
Summary: Switch user does not work
Status: RESOLVED DUPLICATE of bug 426194
Alias: None
Product: plasmashell
Classification: Plasma
Component: Lock/logout (show other bugs)
Version: 5.18.5
Platform: openSUSE Linux
: NOR crash
Target Milestone: 1.0
Assignee: Plasma Bugs List
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2020-07-17 09:39 UTC by Ake Blomberg
Modified: 2021-03-01 22:21 UTC (History)
7 users (show)

See Also:
Latest Commit:
Version Fixed In:


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Description Ake Blomberg 2020-07-17 09:39:01 UTC
SUMMARY
OpenSuSE 15.2 on Presario PC
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.71.0 

Switch user does not work

STEPS TO REPRODUCE
1. Login as any user and click on "Lock Screen"
2. On the upcoming screen click on "Switch User"
   Black screen results.
3. Use "control-alt-f7" to go back to previous sesssion.
Trying 2. again hangs everything.


OBSERVED RESULT
Black screen


EXPECTED RESULT
To be able log in another user

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: OpenSuSE 15.2 KDE plasma
(available in About System)
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.71.0
Qt Version: 5.6.2

ADDITIONAL INFORMATION
Comment 1 Ake Blomberg 2020-07-17 10:09:52 UTC
Wrong Qt version reported. It's 5.12.7
Comment 2 Myriam Schweingruber 2020-07-17 13:20:52 UTC
Confirmed on 5.18.5 on Kubuntu. Now let's see if I can get a backtrace, as Plasmashell crashes completely and the whole computer becomes unresponsive...
Comment 3 Myriam Schweingruber 2020-07-17 13:25:29 UTC
setting to crash, I can't even access a shell anymore, Ctrl+Alt+F1/F7 is not responding anymore
Comment 4 Pavel 2020-07-18 11:07:24 UTC
For me doing a user switch leads to plasmashell crash followed by coredump and SDDM is restarted.
Comment 5 Pavel 2020-07-18 11:07:52 UTC
I am running Plasma 5.19.3.
Comment 6 David Nemeskey 2020-08-30 08:36:48 UTC
I have two related issues.

1. When I lock the screen and change to the "Switch user" screen, then select the user I have just locked the screen with, I can log back in, but my session is completely gone. When I click on the "Switch user" button on the log screen, I hear a pop, so probably SDDM restarts at that point?

2. I also get black screen, but under slightly different circumstances. When I switch to another pty with e.g. Ctrl+Alt+F6, and then back to F7, all I get is a black screen with an unfunctional cursor in the top left corner. I have to kill the sddm-helper process to be able to get back to the UI. However, the programs I was running in the original GUI session are still alive (at least Firefox is), even though orphaned.

I am not sure whether the second issue is related or is a completely different bug, but both problems point to the same "SDDM seems broken" direction.
Comment 7 David Nemeskey 2020-08-30 08:40:36 UTC
> I am not sure whether the second issue is related or is a completely
> different bug, but both problems point to the same "SDDM seems broken"
> direction.

Forgot my config:
KDE Neon 5.19 (should be 5.20 though, I remember upgrading)
Plasma version: 5.19.4
Frameworks version: 5.73.0
Qt version: 5.14.2
Kernel version: 5.4.0-42
i965-va-driver: 2.4.0-0ubuntu1
Comment 8 Geekley 2020-09-05 00:42:52 UTC
I just reported a possible duplicate of this, with additional info.
https://bugs.kde.org/show_bug.cgi?id=426194
Comment 9 abin 2021-01-17 17:01:02 UTC
Confirmed on KDE 5.20.5 
KDE Frameworks 5.78
Qt 5.15.2
Fedora RPMs

STEPS TO REPRODUCE
1. Login as any user and click on "Lock Screen"
2. On the upcoming screen click on "Switch User"
   Black screen results.
Comment 10 gianfabio.palmerini 2021-02-23 08:56:40 UTC
Hi there still the issue on:

Operating System: openSUSE Tumbleweed 20210221
KDE Plasma Version: 5.21.0
KDE Frameworks Version: 5.79.0
Qt Version: 5.15.2
Kernel Version: 5.10.16-1-default
OS Type: 64-bit
Graphics Platform: X11
Comment 11 enno 2021-03-01 08:55:34 UTC
Hello,

What was the last Plasma version without this bug? Does one know the last openSUSE KDE package without this issue?

  Most appreciated.
Comment 12 David Edmundson 2021-03-01 22:21:12 UTC

*** This bug has been marked as a duplicate of bug 426194 ***