The user challenged the format-locked-pins verdict, and the pad program
is the counter-evidence: it hit the SAME 0x88890008 unopenable-endpoint
signature and cured it with a COHERENT stamp set, after which the same
driver family served 4ch happily. This branch previous attempts were
contaminated twice over — a float device-format (the pad bisect proved
the split must be PCM16 device / float mix+host) and no
AudioEndpointBuilder restart (Restart-Service Audiosrv never touches its
dependency, so endpoint configs were never rebuilt). Both mic endpoints
now get one identical coherent stereo set; the octave-low hypothesis
shifts from "raw crossing by design" to "the two endpoint stores
disagreed (stereo render default vs mono capture default)".
enricobuehler
2eed9823e5