[pulseaudio-tickets] [Bug 90781] Microphone is visible by ALSA, but not recognized by PulseAudio

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90781

--- Comment #21 from Raymond <superquad.vortex2 at gmail.com> ---
card 2: S51 [SB Omni Surround 5.1], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 2: S51 [SB Omni Surround 5.1], device 1: USB Audio [USB Audio #1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 2: S51 [SB Omni Surround 5.1], device 2: USB Audio [USB Audio #2]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

what are the function of these three playback devices


aplay -D hw:CARD=S51,DEV=1  --dump-hw-params stereo.wav
aplay -D hw:CARD=S51,DEV=2  --dump-hw-params stereo.wav

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