Can't save preferences in kcm_sddm demonstrates the issue.

Apologies for the abysmal quality of the video, but hopefully

is enough to allow diagnosis.

main.qml:31 does not have the word message in it on the current Plasma/5.27 branch, going back several months.

What Plasma version are you using? And on which distro?


KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.107.0
Qt Version: 5.15.9
Kernel Version: 6.3.6-1-default (64-bit)
Graphics Platform: X11
Processors: 12 × AMD Ryzen 5 3600 6-Core Processor
Memory: 31.2 GiB of RAM
Graphics Processor: AMD Radeon RX 5700

Operating System: cpe:/o:opensuse:tumbleweed:20230612

I’m using the SDB:KDE repositories - openSUSE Wiki, so that’s extra weird.

Thanks for the assistance.

You’re welcome! Can you attach the main.qml file here?

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Sorry, the file you are trying to upload is not authorized (authorized extensions: jpg, jpeg, png, gif, heic, heif, webp, avif).

@ngraham, I can’t be bothered to fiddle with or, so I’ve created 471040 – Can’t save preferences in kcm_sddm and uploaded the file as

All right, let’s follow up in the bug report.

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In the bug report I discovered that our code is indeed wrong. It’ll be fixed in Fix showing error messages (!53) · Merge requests · Plasma / SDDM KCM · GitLab.

Edit: merged already, to be released in Plasma 5.27.6.

You can apply that change locally and then an error message telling you why the theme change can’t be saved should appear.

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(hadn’t read 471040 – Can’t save preferences in kcm_sddm yet, apology for the notification)