Bug 515025

Summary: Can't change the SDDM background
Product: [Applications] systemsettings Reporter: Alice Glass <rockfish+kde>
Component: kcm_sddmAssignee: Plasma Bugs List <plasma-bugs-null>
Status: REPORTED ---    
Severity: normal CC: kde, kde
Priority: NOR    
Version First Reported In: 6.5.5   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Alice Glass 2026-01-24 19:14:49 UTC 
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SUMMARY
When trying to save background change for the Breeze login screen, it fails without showing a password prompt.

STEPS TO REPRODUCE
1. Go to Appearance & Style -> Colors & Themes -> Login Screen (SDDM)
2. Click "Change Background" for the applied login screen
3. Click "Apply".

OBSERVED RESULT
The changes remain unsaved and logs say the following:
```
kf.auth: Action "org.kde.kcontrol.kcmsddm.save" has no parentWindow, assuming QWidgetWindow(0x804031b0760, name="MainWindow#1Window")
kf.i18n.qml: i18n() needs at least one parameter
```

EXPECTED RESULT
A password prompt should appear and the background should be changed,

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.5.5
KDE Frameworks Version: 6.22.0
Qt Version: 6.10.1
Kernel Version: 6.17.13-hardened1-2-hardened (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i5-9300HF CPU @ 2.40GHz
Memory: 16 GiB of RAM (15.5 GiB usable)
Graphics Processor: NVIDIA GeForce GTX 1050

ADDITIONAL INFORMATION