https://bugs.kde.org/show_bug.cgi?id=520636
Bug ID: 520636
Summary: Wayland output screencast sometimes does not update
after keyboard input until cursor movement triggers a
new frame
Classification: Plasma
Product: kwin
Version First 6.6.5
Reported In:
Platform: CachyOS
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
On Plasma Wayland, an output screencast created through the portal/PipeWire
sometimes keeps delivering frames, but the actual captured content does not
update after keyboard input.
The visible symptom is that the remote viewer does not show the last typed
character. Waiting several seconds does not always make it appear. Moving the
mouse or otherwise triggering cursor/desktop activity makes the missing content
appear.
This was observed with a VNC bridge that reads the PipeWire screencast stream
from KWin/xdg-desktop-portal-kde and exposes it through x11vnc rawfb.
The important part is that frame tracing shows the bridge continues receiving
frames at roughly the configured frame rate, but the content signature stays
unchanged for several seconds after the last key press. This suggests that
PipeWire is still transporting frames, but KWin is providing stale screencast
content until another repaint/cursor event happens.
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