https://bugs.kde.org/show_bug.cgi?id=476341
Bug ID: 476341
Summary: After disabling the laptop screen while an external
screen is connected, re-enabling the laptop screen
makes it lose its Plasma containment
Classification: Plasma
Product: plasmashell
Version: master
Platform: Other
OS: Linux
Status: REPORTED
Keywords: multiscreen, qt6
Severity: grave
Priority: NOR
Component: Desktop Containment
Assignee: plasma-b...@kde.org
Reporter: n...@kde.org
CC: notm...@gmail.com
Target Milestone: 1.0
Plasma 6 Wayland, today's git master. GPU hardware is an Intel 10th gen iGPU;
drivers are from Mesa 23.1.9.
STEPS TO REPRODUCE
1. Have a laptop (it has a 4k screen normally run at 200% scale)
2. Plug in an external HDMI screen, either directly, or via a DisplayPort
dongle (doesn't seem to make a difference)
3. Use the KScreen applet to invoke "Switch to External Screen" mode. The
laptop screen correctly turns off.
4. Use the KScreen applet to invoke "Extend to left" or "Extend to right"
modes, or use the KScreen KCM to manually mark the laptop screen as "Enabled"
OBSERVED RESULT
The laptop screen turns on, but it's lost its Plasma containment. All I see on
it is the banner in the corner, and right-clicking on the black desktop does
nothing.
EXPECTED RESULT
Laptop screen turns on and its Plasma containment is shown.
ADDITIONAL INFORMATION
Restarting plasmashell or switching which display is marked as "Primary" does
not fix the issue. It is not clear how to make the laptop display shows its
containment again. For this reason, I'm marking the bug as Grave.
Here's the journal log from plasmashell after restarting it:
Oct 30 14:57:10 Liberator systemd[1884]: Starting plasma-plasmashell.service -
KDE Plasma Workspace...
Oct 30 14:57:11 Liberator systemd[1884]: Started plasma-plasmashell.service -
KDE Plasma Workspace.
Oct 30 14:57:11 Liberator plasmashell[8470]:
file:///home/nate/kde/usr6/share/plasma/plasmoids/org.kde.desktopcontainment/contents/ui/main.qml:93:
TypeError: Cannot call method 'elementSize' of null
Oct 30 14:57:11 Liberator plasmashell[8470]:
file:///home/nate/kde/usr6/share/plasma/plasmoids/org.kde.desktopcontainment/contents/ui/main.qml:192:25:
QML FolderViewDropArea (parent or ancestor of QQuickLayoutAttached): Binding
loop detected for property "minimumWidth"
Oct 30 14:57:11 Liberator plasmashell[8470]:
file:///home/nate/kde/usr6/share/plasma/wallpapers/org.kde.slideshow/contents/ui/main.qml:14:1:
QML WallpaperItem: grabToImage: item's window is not visible
Oct 30 14:57:11 Liberator plasmashell[8470]:
file:///home/nate/kde/usr6/share/plasma/wallpapers/org.kde.slideshow/contents/ui/main.qml:14:1:
QML WallpaperItem: grabToImage: item's window is not visible
Oct 30 14:57:11 Liberator plasmashell[8470]:
file:///home/nate/kde/usr6/share/plasma/plasmoids/org.kde.desktopcontainment/contents/ui/main.qml:93:
TypeError: Cannot call method 'elementSize' of null
Oct 30 14:57:11 Liberator plasmashell[8470]:
file:///home/nate/kde/usr6/share/plasma/plasmoids/org.kde.desktopcontainment/contents/ui/main.qml:192:25:
QML FolderViewDropArea (parent or ancestor of QQuickLayoutAttached): Binding
loop detected for property "minimumWidth"
Oct 30 14:57:11 Liberator plasmashell[8470]: qml: The backend got an unknown
wallpaper provider type. The wallpaper will now fall back to the default.
Please check your wallpaper configuration!
Oct 30 14:57:12 Liberator plasmashell[8470]: qml: SystemTray ItemLoader:
Invalid state, cannot determine source!
Oct 30 14:57:12 Liberator plasmashell[8470]: kf.windowsystem: KWindowInfo is
only functional when running on X11
Oct 30 14:57:12 Liberator plasmashell[8470]: QFont::setPointSizeF: Point size
<= 0 (0.000000), must be greater than 0
Oct 30 14:57:13 Liberator plasmashell[8470]:
file:///home/nate/kde/usr6/share/plasma/shells/org.kde.plasma.desktop/contents/views/Panel.qml:102:5:
QML Connections: Detected function "onActivated" in Connections element. This
is probably intended to be a signal handler but no signal of the target matches
the name.
Oct 30 14:57:13 Liberator plasmashell[8470]: QObject::startTimer: Timers cannot
be started from another thread
Oct 30 14:57:13 Liberator plasmashell[8470]: Connecting to deprecated signal
QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
Oct 30 14:57:14 Liberator plasmashell[8470]:
inotify_add_watch(/var/lib/samba/usershares) failed: (Permission denied)
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