[Bug 1883670] [NEW] Disable IEC958 on HP Thunderbolt Dock

[Launchpad Bug Tracker]

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[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.

** Affects: hwe-next
     Importance: Undecided
         Status: New

** Affects: alsa-lib (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: alsa-lib (Ubuntu Focal)
     Importance: Undecided
         Status: New

** Affects: alsa-lib (Ubuntu Groovy)
     Importance: Undecided
         Status: New


** Tags: oem-priority originate-from-1880102 patch stella
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Disable IEC958 on HP Thunderbolt Dock
https://bugs.launchpad.net/bugs/1883670
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