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fix(vdisplay/kwin): make the streamed output the sole desktop (PUNKTFUNK_KWIN_VIRTUAL_PRIMARY)

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On a headless KDE appliance the session has two outputs — run-headless-kde.sh's `kwin --virtual`
bootstrap (where plasmashell draws by default) and our per-session streamed output — so the client
saw only the wallpaper of an empty extended output (the KWin analogue of the GNOME/Mutter
VIRTUAL_PRIMARY issue). New opt-in PUNKTFUNK_KWIN_VIRTUAL_PRIMARY: after creating the virtual
output, set it primary via kscreen-doctor (KWin then re-homes the desktop onto it and disables the
bootstrap), then belt-and-suspenders disable anything still enabled. The keepalive re-enables the
bootstrap on teardown — though KWin also auto-re-enables it when our output is reclaimed, so there's
never a zero-output window. Set in packaging/kde/host.env. Verified live on the Fedora 44 KDE box:
mid-session the streamed output is the sole desktop at 0,0; post-session the bootstrap is back.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Enrico Bühler
2026-06-13 21:04:29 +00:00
parent 0de83d31d4
commit 92bb0de0c6
2 changed files with 105 additions and 3 deletions
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packaging/kde/host.env
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@@ -10,3 +10,8 @@ PUNKTFUNK_COMPOSITOR=kwin
PUNKTFUNK_VIDEO_SOURCE=virtual
PUNKTFUNK_ZEROCOPY=1
PUNKTFUNK_INPUT_BACKEND=libei
# Make the per-session streamed output the SOLE desktop, so plasmashell + windows render on it
# rather than on the headless session's `kwin --virtual` bootstrap output (without this the client
# sees only the wallpaper of an empty extended output). KWin re-homes the desktop; the bootstrap is
# re-enabled on teardown.
PUNKTFUNK_KWIN_VIRTUAL_PRIMARY=1