The Pi 5 vc4hdmi exposes only IEC958 and has no hardware mixing, so raw
ALSA is exclusive: once Chromium's Web Audio stream holds the HDMI device,
the media-element audio (the actual track) can't open it and stays silent
even though the analyser sees the signal. Install PipeWire + pipewire-pulse
as a software mixer (it also handles the IEC958 conversion) so every
Chromium stream mixes onto HDMI. Enable lingering so the user services
start at boot; set the HDMI sink to full volume.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
