(In reply to Takashi Iwai from comment #271)
> And how is the application set up?  Does it run over PulseAudio backend or
> accesses directly ALSA devices?

Everything on PulseAudio.
(Using a standard gnome desktop.)

> The BATCH workaround was needed for PulseAudio.  Does any other application
> using PulseAudio (wrt capture) work on your device?

Well, I've also tried arecord, gnome-sound-recorder.
These and Skype work with and without the BATCH workaround.

Steam and Discord have severe issues with the workaround.

> And it'd be strange if this setup change makes any difference on USB webcam
> behavior.  If so, it must be a bug in PulseAudio.

The patch seems to trigger the issue as long as the device is in use -
even if just for playback.

With the workaround, if I use HDMI output and USB webcam, the sound is OK (i.e, 
this device not in use).
Sound card's line-out + any input source causes problem.

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https://bugs.launchpad.net/bugs/1801540

Title:
  Microphone distorted sound on ALC892/1220 on AMD chipsets

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