PLN on the NVIDIA card: 'it NEVER served me, 100% of the time'. He is right,
and the reason it kept getting chosen was a saved pin to pro-audio — a profile
whose 'available' flag is unconditionally yes, because it maps raw PCMs and
asks no questions about cables. So four sinks reported perfectly healthy while
every ELD on the card read monitor_present 0 and every connector read
disconnected. Sound was not muted or misrouted, it was converted and discarded.
The pin is retired (that card is now off, and WirePlumber's own findBestProfile
will not go back to pro-audio by name). The check that would have said so in
one line now exists, keyed to the ELD rather than to the profile's own opinion.
Narrow on purpose: it accuses only a sink that leaves the box over a video
cable, reusing fold-orbits' predicate, because the sof card carries Speaker AND
an HDMI output — a check keyed on the CARD would have accused the laptop
speakers while sound was coming out of them.
The first resolver called realpath() on /proc/asound/cardN, which is a plain
directory, matched nothing, and made the detector dead code that reported
success. A test now asserts it reads sysfs.
