https://bugs.kde.org/show_bug.cgi?id=506713
Bug ID: 506713
Summary: xdg-desktop-portal-kde crashes on startup, causing
freeze after closing file dialogs on Plasma 6.4.2
Classification: Plasma
Product: xdg-desktop-portal-kde
Version First 6.4.2
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
SUMMARY
xdg-desktop-portal-kde crashes on startup, causing apps to freeze briefly
(~0.5–10s) when closing file dialogs.
STEPS TO REPRODUCE
1. Open any application that uses the Qt/KDE file dialog (e.g. Dolphin, Kate,
Gwenview).
2. Trigger a file dialog (e.g. File → Open).
3. Close the dialog with or without selecting anything.
OBSERVED RESULT
The application freezes for a short period (initially 5–10 seconds, now ~0.5s
after a workaround) after the file dialog closes.
This corresponds to a timeout caused by xdg-desktop-portal-kde failing to
respond on D-Bus due to crashing on startup.
Logs show:
pgsql
Copier
Modifier
qt.qpa.xcb: could not connect to display
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it
was found.
This application failed to start because no Qt platform plugin could be
initialized.
xdg-desktop-portal-kde.service: Failed with result 'core-dump'
EXPECTED RESULT
The file dialog closes immediately and the application remains responsive,
without freezing.
SOFTWARE/OS VERSIONS
Operating System: EndeavourOS
KDE Plasma Version: 6.4.2
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.1
Kernel Version: 6.15.5-zen1-1-zen (64-bit)
Graphics Platform: Wayland
Display Manager: SDDM
xdg-desktop-portal: 1.20.3-1
xdg-desktop-portal-kde: 6.4.2-1
xcb-util-cursor: installed
xdg-desktop-portal-gtk: not installed
ADDITIONAL INFORMATION
As a workaround, I created a user-level systemd service to manually start the
portal:
# ~/.config/systemd/user/xdg-desktop-portal-kde.service
[Unit]
Description=xdg-desktop-portal backend for KDE
After=xdg-desktop-portal.service
PartOf=xdg-desktop-portal.service
[Service]
ExecStart=/usr/lib/xdg-desktop-portal-kde
Restart=on-failure
Environment=QT_QPA_PLATFORM=xcb
Environment=DISPLAY=:0
Environment=XDG_CURRENT_DESKTOP=KDE
[Install]
WantedBy=default.target
This reduced the freeze time from ~10s to ~0.5s, confirming that the backend is
involved. However, the service still fails with a core dump on startup.
This bug appears distinct from Bug 506266, which was GTK-related. My setup does
not include the GTK portal, and the crash is confirmed to originate from
xdg-desktop-portal-kde.
This report and troubleshooting were assisted by ChatGPT to ensure clarity and
accuracy.
Happy to provide a backtrace or coredump if needed.
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