SUMMARY In version 5.20.5-1 in Debian11 with Wayland, the taskbar suddenly and randomly disappears just to reappear around 2 seconds later. It seems like some plasmashell thing is getting restarted. It always happens out of nowhere at different times as far as I can tell - I didn't run any upgrade or anything. No apps are closed, it's just that the bottom taskbar moves down and then reappears. What could be causing this, which logs to check for what and how to prevent this? STEPS TO REPRODUCE 1. Run Debian11/KDE 2. Wait / use the machine OBSERVED RESULT Taskbar suddenly disappears and reappears. EXPECTED RESULT The taskbar does not disappear and move down (it wiggles the windows). SOFTWARE/OS VERSIONS Linux/KDE Plasma: Debian 11 KDE Plasma Version: 5.20.5 KDE Frameworks Version: 5.78.0 Qt Version: 5.15.2 ADDITIONAL INFORMATION
Recently this occurred without the taskbar reappearing right after. Hence, I had time to open the task manager and search for plasma. Plasmashell was not running but only: systemd->sddm->sddm-helper->startplasma-wayland->kwin_wayland->startplasma-waylandsession Again, I didn't do anything that may have caused this at that point and running kstart5 plasmashell made it reappear. The first output is: kf.coreaddons: Expected JSON property "X-Plasma-ContainmentCategories" to be a string list. Treating it as a list with a single entry: "panel" org.kde.plasma.desktop.defaultPanel kf.coreaddons: Expected JSON property "X-Plasma-ContainmentCategories" to be a string list. Treating it as a list with a single entry: "panel" org.kde.plasma.desktop.appmenubar kf.coreaddons: Expected JSON property "X-Plasma-ContainmentCategories" to be a string list. Treating it as a list with a single entry: "panel" org.kde.plasma.desktop.emptyPanel kf.plasma.quick: Applet preload policy set to 1 Cyclic dependency detected between "file:///usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/kirigami.2/styles/org.kde.desktop.plasma/Units.qml" and "file:///usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/kirigami.2/styles/org.kde.desktop.plasma/Units.qml" qt.svg: <input>:406:376: Could not add child element to parent element because the types are incorrect. qt.svg: <input>:407:130: Could not add child element to parent element because the types are incorrect. qt.svg: <input>:408:130: Could not add child element to parent element because the types are incorrect. qt.svg: <input>:408:393: Could not add child element to parent element because the types are incorrect. qt.svg: <input>:409:130: Could not add child element to parent element because the types are incorrect. qt.svg: <input>:410:129: Could not add child element to parent element because the types are incorrect. qt.svg: <input>:411:129: Could not add child element to parent element because the types are incorrect. qt.svg: <input>:412:129: Could not add child element to parent element because the types are incorrect. qt.svg: <input>:413:129: Could not add child element to parent element because the types are incorrect. qt.svg: <input>:413:379: Could not add child element to parent element because the types are incorrect. qt.svg: <input>:413:631: Could not add child element to parent element because the types are incorrect. trying to show an empty dialog file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height" file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height" qt.qpa.wayland: Wayland does not support QWindow::requestActivate() kf.plasma.core: requesting config for "Folder View" without a containment! QObject::disconnect: Unexpected nullptr parameter libpng warning: iCCP: known incorrect sRGB profile kf.coreaddons: KDirWatch: "/usr/share/desktop-base/homeworld-theme/wallpaper" is a directory. Use addDir! kf.coreaddons: KDirWatch: "/usr/share/desktop-base/futureprototype-theme/wallpaper" is a directory. Use addDir! kf.coreaddons: KDirWatch: "/usr/share/desktop-base/futureprototype-theme/wallpaper-withlogo" is a directory. Use addDir! kf.coreaddons: KDirWatch: "/usr/share/desktop-base/joy-theme/wallpaper" is a directory. Use addDir! kf.coreaddons: KDirWatch: "/usr/share/desktop-base/joy-inksplat-theme/wallpaper" is a directory. Use addDir! kf.coreaddons: KDirWatch: "/usr/share/desktop-base/joy-theme/lockscreen" is a directory. Use addDir! kf.coreaddons: KDirWatch: "/usr/share/desktop-base/lines-theme/wallpaper" is a directory. Use addDir! kf.coreaddons: KDirWatch: "/usr/share/desktop-base/lines-theme/lockscreen" is a directory. Use addDir! kf.coreaddons: KDirWatch: "/usr/share/desktop-base/moonlight-theme/wallpaper" is a directory. Use addDir! kf.coreaddons: KDirWatch: "/usr/share/desktop-base/moonlight-theme/lockscreen" is a directory. Use addDir! kf.coreaddons: KDirWatch: "/usr/share/desktop-base/softwaves-theme/wallpaper" is a directory. Use addDir! kf.coreaddons: KDirWatch: "/usr/share/desktop-base/softwaves-theme/lockscreen" is a directory. Use addDir! kf.coreaddons: KDirWatch: "/usr/share/desktop-base/spacefun-theme/wallpaper" is a directory. Use addDir! Plasma Shell startup completed
Thank you for the bug report! It does indeed sound like Plasma is crashing and restarting. However Plasma 5.20.5 is no longer supported by KDE; supported versions are 5.24 and 5.25. Your distro is responsible for providing support for older versions of KDE software. Please do one of the following: - Upgrade to a supported version (perhaps using Debian Testing) and see if the issue is still relevant - Report the issue to your distro
- I can only and will upgrade to a much newer version after Debian upgraded to Debian12. Once I did, I will try to check my submitted bugs and update them. See https://unix.stackexchange.com/questions/584892/what-would-be-needed-by-debian-to-ship-newer-versions-of-the-kde-desktop-environ/584903 - Done: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1019433 (and only after I did this does it make sense to mark this issue as resolved)