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

[Kai-Heng Feng]

After upgrade the package from -proposed, the useless S/PDIF option is
gone from the sound panel of Gnome Control Center.

** Tags removed: verification-needed-focal
** Tags added: verification-done-focal

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Title:
  Disable IEC958 on HP Thunderbolt Dock

Status in HWE Next:
  New
Status in OEM Priority Project:
  Confirmed
Status in alsa-lib package in Ubuntu:
  Fix Committed
Status in alsa-lib source package in Focal:
  Fix Committed
Status in alsa-lib source package in Groovy:
  Fix Committed

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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