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fix(headless/kde): start Xwayland + detect its display so X11 apps work
X11/Electron apps (Discord — "Missing X Server or $DISPLAY", Steam, many launchers) failed in the
headless KWin session: `kwin_wayland --virtual` starts NO X server unless asked, and even with one
KWin reserves the X11 display + starts Xwayland *on demand* (no Xwayland process or "Using public
X11 display" log line until the first client connects) — so the old detection (pgrep the Xwayland
process) found nothing and never exported DISPLAY. Two fixes: pass `--xwayland`, and detect the
display from the reserved /tmp/.X11-unix/X<N> socket (with the log + process checks as fallbacks).
Verified live on the Fedora 44 KDE box: DISPLAY=:0 lands in plasmashell + the activation env and
xdpyinfo responds, so menu-launched X11 apps open a display.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-13 23:17:56 +00:00
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