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

[Rex Tsai]

The upstream alia-lib has not yet accepted the patch[1].

Shengyao, Hui, please clarify all "Cmedia Audio" chip does not support
"Digital Output(S/PDIF)" as iec958 device.


[1] conf: USB - add "Cmedia Audio" to USB-Audio.pcm.iec958_device by jason77-wang · Pull Request #122 · alsa-project/alsa-lib - https://github.com/alsa-project/alsa-lib/pull/122/commits/879d57d979b59be8632ba788d5f567f2b6ec0c19

Regards
-Rex

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

Status in OEM Priority Project:
  In Progress
Status in alsa-lib package in Ubuntu:
  In Progress
Status in alsa-lib source package in Focal:
  In Progress
Status in alsa-lib source package in Groovy:
  In Progress
Status in alsa-lib source package in Hirsute:
  In Progress

Bug description:
  [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.

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