Created attachment 167085 [details] KCM screenshot SUMMARY All the settings dialogs use light background in dark mode (Breeze Dark). Switching to a light theme doesn't seem to update background color. Other applications (notably Firefox, Chrome, Kontact, Kate, GTK apps) use proper dark background. When starting, the following log message appears: systemsettings[15709]: kf.kirigami.platform: Failed to find a Kirigami platform plugin for style "Fusion" STEPS TO REPRODUCE 1. Change theme/color scheme to Breeze Dark OBSERVED RESULT Some (Kirigami?) apps use light background. EXPECTED RESULT All the app should use the background as set. SOFTWARE/OS VERSIONS OS: KDE neon 6.0 x86_64 Plasma Version: 6.0.2 Qt Version: 6.6.2 DE: Plasma WM: KWin WM Theme: Bryza Theme: Breeze Dark [Plasma], Breeze [GTK2/3] Icons: [Plasma], breeze [GTK2/3]
This happens when there's a setup problem on your machine. Likely plasma-integration is missing, but it could be a few other things too. Please follow up with your distro or at https://discuss.kde.org to get help with the issue.
It's a Neon, recently upgraded to Plasma 6.0.0 and now 6.0.2. I've checked that on a new account the symptoms are the same: if you switch to the dark mode (eg. in the Quick Settings) some parts of the theme are not loaded (colors in the Kirigami apps, window title font is also reset to default). plasma-integration is installed as well as all the "breeze" recommended packages. I've seen one or two similar reports elsewhere but without any solutions nor clues.
It was indeed an ancient version of plasma-integration, apparently apt didn’t upgrade it to 6.0.2. Thanks!
I had the same issue after the Plasma 6 update (KDEneon user edition). It was also caused by the `plasma-integration` package being stuck on version `5.19.5-0xneon+20.04+focal+build11`. But neither doing a `pkcon update` nor `apt update && apt full-upgrade` found any available updates. The cause for this were apt preferences defined under `/etc/apt/preferences.d`, specifically `99-plasma-integration` which pinned the package to version `5.1*`. This seems to be a remnant of an old version of neon, as I am using neon on this device since 2018 and have been upgrading neon from then without doing a fresh reinstallation. So if anyone has the same issue as I had, check your `/etc/apt/preferences.d` directory for remnants. For reference, a fresh, up-to-date neon install currently only contains the following files: `50-neon-ubuntu-release-upgrader 99-jammy-overrides 99-neon-base-files org-kde-neon-net-launchpad-ppa-mozillateam-pin`. Meanwhile, my current installation additionally contained: `99-neon-software-properties 99-plasma-integration 99-pulseaudio-qt`.