[Bug 1883670] Re: Disable IEC958 on HP Thunderbolt Dock

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https://bugs.launchpad.net/bugs/1883670

Title:
  Disable IEC958 on HP Thunderbolt Dock

Status in HWE Next:
  New
Status in alsa-lib package in Ubuntu:
  New
Status in alsa-lib source package in Focal:
  New
Status in alsa-lib source package in Groovy:
  New

Bug description:
  [Impact]
  On HP Thunderbolt Dock, unusable SPDIF can be selected as output from PulseAudio.

  [Fix]
  Disable IEC958 (SPDIF) through ALSA UCM.

  [Test]
  With the UCM applied, `pactl` and audio panel in gnome-control-center no longer have SPDIF option.

  [Regression Potential]
  Low. This fix limits to the HP Thunderbolt Dock, other devices are unaffected.

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