[Bug 1921452] [NEW] [SRU] alsa-lib: conf: USB - add "Cmedia Audio" to USB-Audio.pcm.iec958_device

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You have been subscribed to a public bug by Shengyao Xue (xueshengyao):

[Impact]
On Cmedia Audio, 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.

[Where problems will occur]
This fix limits to the Cmedia Audio only, other devices are unaffected.

** Affects: oem-priority
     Importance: Critical
     Assignee: Shengyao Xue (xueshengyao)
         Status: In Progress

** Affects: alsa-lib (Ubuntu)
     Importance: Undecided
     Assignee: Shengyao Xue (xueshengyao)
         Status: In Progress

** Affects: alsa-lib (Ubuntu Focal)
     Importance: Undecided
     Assignee: Shengyao Xue (xueshengyao)
         Status: In Progress

** Affects: alsa-lib (Ubuntu Groovy)
     Importance: Undecided
     Assignee: Shengyao Xue (xueshengyao)
         Status: In Progress

** Affects: alsa-lib (Ubuntu Hirsute)
     Importance: Undecided
     Assignee: Shengyao Xue (xueshengyao)
         Status: In Progress


** Tags: oem-priority originate-from-1916751 originate-from-1916753 somerville
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[SRU] alsa-lib: conf: USB - add "Cmedia Audio" to USB-Audio.pcm.iec958_device
https://bugs.launchpad.net/bugs/1921452
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