https://bugs.kde.org/show_bug.cgi?id=512620
Bug ID: 512620
Summary: ScreenCast virtual monitor can only be negotiated at
1920x1080
Classification: Plasma
Product: kwin
Version First 6.3.6
Reported In:
Platform: Debian testing
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: screencasting
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
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SUMMARY
I'm using plasma 6.3.6 patched with [this commit][1], and
xdg-desktop-portal-kde is patched with [this commit][2] so that I can create a
virtual monitor with kwin_wayland launched with the `--virtual` flag.
[1]: https://invent.kde.org/plasma/kwin/-/merge_requests/8472
[2]:
https://github.com/KDE/xdg-desktop-portal-kde/commit/8def3b7956d5c544764d4c53a3e848cb86ca26b9
However, it seems when starting the PipeWire stream, I must use a resolution of
1920x1080. Otherwise I won't get any frames. If I try to re-negotiate with a
different resolution, the screen will freeze and the PipeWire stream will no
longer be usable. This issue only reproduces on KDE and doesn't reproduce on
GNOME.
The renegotiation code can be found
[here](https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/desktop_capture/linux/wayland/shared_screencast_stream.cc;l=411;drc=9d5809a28521f1c6b09360e45b0bf7e1e7784214).
STEPS TO REPRODUCE
1. Create an [XDG RemoteDesktop
session](https://flatpak.github.io/xdg-desktop-portal/docs/doc-org.freedesktop.portal.RemoteDesktop.html#org-freedesktop-portal-remotedesktop-createsession)
2. Configure it to use the `VIRTUAL` source with
[ScreenCast.SelectSources](https://flatpak.github.io/xdg-desktop-portal/docs/doc-org.freedesktop.portal.ScreenCast.html#org-freedesktop-portal-screencast-selectsources)
3. [Start the
session](https://flatpak.github.io/xdg-desktop-portal/docs/doc-org.freedesktop.portal.RemoteDesktop.html#org-freedesktop-portal-remotedesktop-start)
and grab the PipeWire nodes
4. Connect to the PipeWire stream with a resolution of 2560x1440, observe
5. Now destroy everything and redo steps 1-3
6. Connect to the PipeWire stream with a resolution of 1920x1080
7. Renegotiate with a resolution of 2560x1440
OBSERVED RESULT
In steps 4 and 7, no output is received via PipeWire; the stream becomes
unusable
EXPECTED RESULT
The virtual monitor should be resized to the specified resolutions, and the
stream remains valid
SOFTWARE/OS VERSIONS
(available in the Info Center app, or by running `kinfo` in a terminal window)
Operating System: Linux
KDE Plasma Version: 6.3.6 (with patches mentioned above)
KDE Frameworks Version: 6.13.0
Qt Version: 6.8.2
Graphics Platform: offscreen
ADDITIONAL INFORMATION
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