https://bugs.kde.org/show_bug.cgi?id=512183
Bug ID: 512183
Summary: Wayland: clipboard sometimes ends up as
application/x-kde-onlyReplaceEmpty after Spectacle
full-screen 4K PNG
Classification: Plasma
Product: xdg-desktop-portal-kde
Version First unspecified
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
Created attachment 186839
--> https://bugs.kde.org/attachment.cgi?id=186839&action=edit
kwin-log portal-log wl-after wl-before pw.json
On Plasma Wayland (6.5.2) under openSUSE Tumbleweed with an NVIDIA GPU, copying
a full-screen 4K screenshot from Spectacle to the clipboard intermittently
breaks the Wayland clipboard pipeline.
After several full-screen captures, the clipboard stops exposing any image MIME
types and instead contains only:
application/x-kde-onlyReplaceEmpty
At this point pasting images into browsers or applications fails, and all
screenshot tools (including ksnip or Flameshot) can no longer place images into
the clipboard. The issue persists until the portals are restarted:
systemctl --user restart xdg-desktop-portal xdg-desktop-portal-gtk
or the user logs out and back in.
Small region captures usually continue to work; the problem is strongly
correlated with large 3840×2160 PNG screenshots produced by Spectacle.
Attached logs (wl-before.txt, wl-after.txt, portal-log.txt, kwin-log.txt,
pw.json) show:
before the issue: normal clipboard types (image/png, application/x-qt-image,
etc.);
after the issue: only application/x-kde-onlyReplaceEmpty;
portal and PipeWire warnings around the moment of failure;
KWin Wayland logs containing related errors.
This suggests a failure when the xdg-desktop-portal / Wayland clipboard stack
processes Spectacle’s large PNG buffer, causing KDE’s clipboard to fall back to
the internal placeholder MIME type.
I can run additional diagnostics or patches if needed.
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