The launcher's sudo -u archipelago invocation set DISPLAY/HOME but not
XDG_RUNTIME_DIR, so Chromium's audio backend couldn't find the PipeWire-Pulse
socket at /run/user/<uid>/pulse/native. It silently fell back to raw ALSA
"default", which also failed ("Connection refused"), producing no HDMI audio
at all with no visible error since --noerrdialogs suppresses it.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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