SUMMARY In current Plasma master, changing the wallpaper will only work as long as plasmashell is running. Once it is restarted, it will fall back to the default wallpaper. STEPS TO REPRODUCE 1. Change wallpaper 2. Restart plasmashell (kquitapp5 plasmashell && plasmashell) OBSERVED RESULT Wallpaper is set to default. EXPECTED RESULT User-selected wallpaper is shown. SOFTWARE/OS VERSIONS KDE Plasma Version: Current git master KDE Frameworks Version: Current git master Qt Version: 5.15.0 ADDITIONAL INFORMATION I'm not sure if it is noise or not, but the following is printed when applying settings in the dialog: file:///usr/share/plasma/wallpapers/org.kde.image/contents/ui/main.qml:176:13: Unable to assign [undefined] to int
Debugging with einar77 and DavidRedondo on IRC, we found that this commit is the culprit: https://invent.kde.org/plasma/plasma-workspace/-/commit/b707970879f091d4ba356bcf909a7f4c8c3b4422 specifically this part: - <default></default> + <default>preferred://wallpaperlocations</default> reverting it fixes the issue.
Further suggestions from DavidRedondo, changing that to an actual path on the local file system works too.
That url will trigger m_slidePaths << QStandardPaths::locateAll(QStandardPaths::GenericDataLocation,QStringLiteral("wallpapers"), QStandardPaths::LocateDirectory); m_slidePaths.removeAll(path); But I don't know why that breaks stuff
It seems that after editing the relevant config.xml file, the bug is "fixe"; as in if I put "<default>preferred://wallpaperlocations</default>" back, changing the wallpaper still works...
Cannot reproduce with current git master, FWIW.
Well, after a few rounds of debugging with fvogt on IRC (he did most of the work ;) it turns out that it's in fact, an RPM (the package manager) bug! For those ending up here from search engines: remove /usr/share/plasma/wallpapers/org.kde.slideshow/contents/config/main.xml and reinstall plasma5-workspace.
*** Bug 423433 has been marked as a duplicate of this bug. ***