https://bugs.kde.org/show_bug.cgi?id=508253
Bug ID: 508253
Summary: Black logon screen because of
'UserFeedback.org.kde.plasmashell.conf.lock'
Classification: Plasma
Product: plasmashell
Version First 6.4.4
Reported In:
Platform: Neon
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Startup process
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: 1.0
SUMMARY
KDE Plasma Shell is not starting after login, just showing a black screen with
mouse cursor.
I have experienced this several times over the years, but newer really looked
or found the cause/solution I have today.
* Start computer
* Login
* Black screen with KDE spinning wheel
* Black screen with only the mouse cursor
Sometimes a reboot could fix the issue, but today I rebooted five times with
the same result.
The log showed the cause of KDE Plasma Shell not starting:
```
aug 14 17:07:36 rpc-client systemd[1350]: Starting plasma-plasmashell.service -
KDE Plasma Workspace...
aug 14 17:08:20 rpc-client plasmashell[2506]: QLockFile: Lock file
'/home/myUser/.config/kde.org/UserFeedback.org.kde.plasmashell.conf.lock' has a
modification time in the future
aug 14 17:08:20 rpc-client systemd[1350]: plasma-plasmashell.service: start
operation timed out. Terminating.
```
SOFTWARE/OS VERSIONS
Operating System: KDE neon User Edition
KDE Plasma Version: 6.4.4
KDE Frameworks Version: 6.17.0
Qt Version: 6.9.1
Kernel Version: 6.14.0-27-generic (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i5-10210U CPU @ 1.60GHz
Memory: 32 GiB of RAM (31,2 GiB usable)
Graphics Processor: Intel® UHD Graphics
Manufacturer: HP
Product Name: HP 260 G4 Desktop Mini PC
ADDITIONAL INFORMATION
Observation 1:
I pressed Ctrl+Alt+Delete and the Sleep-Restart-Shutdown-Logout-Cancel screen
appeared.
Logout didn't work, but reboot did.
Observation 2:
I pressed Linux/Super key and KRunner shoved up.
I started Kate, worked OK.
I started Firefox, worked OK.
Searched how to restart KDE Plasma Shell
Tried "systemctl restart --user plasma-plasmashell", didn't return. Ctrl+C
after some time.
Tried "systemctl status plasma-plasmashell", which showed logentried showed
earlier.
Solution:
I started a console and ran:
```bash
rm .config/kde.org/UserFeedback.org.kde.plasmashell.conf.lock
```
And immediately the pending KDE Plasma Shell restart worked and the desktop
icons/panel appeared as expected.
Suggestion:
I might be stupid for not checking the logs before, and now I know how to fix
this in the future.
But KDE would be more user friendly and robust, if it show a dialogue on the
screen like this:
```
Warning
A desktop lock file exist with a modification time in the future.
Do you want to ignore the lock file, and start KDE Plasma Shell anyway (y/N) ?
Lock file:
/home/myUser/.config/kde.org/UserFeedback.org.kde.plasmashell.conf.lock
Note: The purpose of the lock file is to prevent multiple user sessions from
accessing the same user files at the same time, which may corrupt the user
files. Only select Yes if you are sure that your current user session is the
only one accessing the user files now.
```
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