Since about Plasma 6 onward I've been getting system restarts when attempting to play back video files and/or seek through them.
Kernel 6.5.0-41
KDE neon 6
Plasma 6.1.2
Qt 6.7.0
Ryzen 7 3700x CPU
AMD R9 390 GPU
16GB DDR4 RAM
The system will crash and reboot when:
- Attempting to play any video with an mp4 container (mpv and vlc tested)
- Attempting to seek with the mouse while playing most videos (mp4 and matroska)
- Scrolling too fast in a file manager
- Clicking and dragging to resize various windows (terminal, browsers, etc)
The system performs fine when:
- Playing videos in a webm container
- Playing videos in software like avidemux, kdenlive, gwenview, etc.
- Streaming video in a web browser
The issue has persisted through these toubleshooting measures:
- Update to latest BIOS firmware
- Switching between Wayland and X11
- Substitution of the PSU to a brand new unit
My assumption so far is that it's not hardware related. Currently I suspect it's Plasma. Below is the journal output of records around one such crash time of 5.19-5.20pm:
<journalctl /usr/bin/plasmashell>
Jul 13 17:19:21 pcname plasmashell[1680]: kde.plasmashell: Aborting shell load: The activity manager daemon (kactivitymanagerd) is not running.
Jul 13 17:19:21 pcname plasmashell[1680]: kde.plasmashell: If this Plasma has been installed into a custom prefix, verify that its D-Bus services dir is known to the system for the daemon to be activatable.
Jul 13 17:19:21 pcname plasmashell[1680]: kde.plasmashell: Aborting shell load: The activity manager daemon (kactivitymanagerd) is not running.
Jul 13 17:19:21 pcname plasmashell[1680]: kde.plasmashell: If this Plasma has been installed into a custom prefix, verify that its D-Bus services dir is known to the system for the daemon to be activatable.
Jul 13 17:19:22 pcname plasmashell[1680]: kf.plasma.quick: Applet preload policy set to 1
Jul 13 17:19:22 pcname plasmashell[1680]: file:///usr/share/plasma/plasmoids/org.kde.desktopcontainment/contents/ui/main.qml:195:25: QML FolderViewDropArea (parent or ancestor of QQuickLayoutAttached): Binding loop detected for property "minimumWidth"
Jul 13 17:19:22 pcname plasmashell[1680]: Toolbox not loading, toolbox package is either invalid or disabled.
Jul 13 17:19:24 pcname plasmashell[1680]: file:///usr/share/plasma/plasmoids/org.kde.plasma.private.systemtray/contents/ui/main.qml:162:21: QML KSortFilterProxyModel: Binding loop detected for property "sourceModel"
Jul 13 17:19:24 pcname plasmashell[1680]: file:///usr/share/plasma/plasmoids/org.kde.plasma.private.systemtray/contents/ui/main.qml:162:21: QML KSortFilterProxyModel: Binding loop detected for property "sourceModel"
Jul 13 17:19:24 pcname plasmashell[1680]: qt.dbus.integration: Could not connect "org.cups.cupsd.Notifier" to PrinterFinishingsChanged(QString, QString, QString, uint, QString, bool) :
Jul 13 17:19:24 pcname plasmashell[1680]: qt.core.qobject.connect: QObject::connect: No such signal Solid::Backends::Fstab::FstabStorageAccess::repairRequested(QString) in ./src/solid/devices/frontend/storageaccess.cpp:23
Jul 13 17:19:24 pcname plasmashell[1680]: qt.core.qobject.connect: QObject::connect: No such signal Solid::Backends::Fstab::FstabStorageAccess::repairDone(Solid::ErrorType, QVariant, QString) in ./src/solid/devices/frontend/storageaccess.cpp:24
Jul 13 17:19:24 pcname plasmashell[1680]: kameleon supported false
Jul 13 17:19:24 pcname plasmashell[1680]: kameleon enabled true
Jul 13 17:19:24 pcname plasmashell[1680]: qml: SystemTray ItemLoader: Invalid state, cannot determine source!
Jul 13 17:19:24 pcname plasmashell[1680]: QFont::setPointSizeF: Point size <= 0 (0.000000), must be greater than 0
Jul 13 17:19:24 pcname plasmashell[1680]: error getting max screen brightness via dbus: QDBusError("org.freedesktop.DBus.Error.UnknownObject", "No such object path '/org/kde/Solid/PowerManagement/Actions/BrightnessControl'")
Jul 13 17:19:24 pcname plasmashell[1680]: error getting max keyboard brightness via dbus QDBusError("org.freedesktop.DBus.Error.UnknownObject", "No such object path '/org/kde/Solid/PowerManagement/Actions/KeyboardBrightnessControl'")
Jul 13 17:19:24 pcname plasmashell[1680]: org.kde.klipper: Invalid or non-local url for preview: QUrl("mtp:/Pixel 5/Internal shared storage/Tempfold/archive.zip")
Jul 13 17:19:25 pcname plasmashell[1680]: org.kde.pulseaudio: No object for name "alsa_output.usb-VIA_Technologies_Inc._Audinst_HUD-mx2-00.analog-stereo.monitor"
Jul 13 17:19:27 pcname plasmashell[1680]: file:///usr/share/plasma/plasmoids/org.kde.plasma.keyboardindicator/contents/ui/main.qml:61:13: Unable to assign [undefined] to bool
Jul 13 17:22:17 pcname plasmashell[1653]: kde.plasmashell: Aborting shell load: The activity manager daemon (kactivitymanagerd) is not running.
Jul 13 17:22:17 pcname plasmashell[1653]: kde.plasmashell: If this Plasma has been installed into a custom prefix, verify that its D-Bus services dir is known to the system for the daemon to be activatable.
Suggestions for next steps would be welcome. Is it worth considering a rollback to the previous/older Plasma versions? Assuming Plasma doesn't like my DAC or keyboard or whatever, is it worth substituting or removing USB devices?
I remember omitting a hardware decoding line from mpv.conf. But I'm still getting the issue occasionally (even though playback in most cases now is fine).
It does sound like the graphics side may be the culprit somehow. Not necessarily the hardware being broken, but the R9 is fairly old and perhaps support got broken somewhere along the way, and nobody ever noticed it?
Are you using the radeon or amdgpu driver btw? There is a section on the Arch wiki that talks about into instability with the radeon driver specifically with the R9 390: https://wiki.archlinux.org/title/AMDGPU#R9_390_series_poor_performance_and/or_instability
IIRC Plasma 6/QT6 does use vulkan heavily instead of OpenGL. Some additional things you could try: