[Bug 1937980] Re: [SRU] the speaker doesn't work on Dell sdw sdca machine with kernel-5.13

[Hui Wang]

Hi sponsor team, This is the debdiff for impish. thx.

** Patch added: "alsa-ucm-conf_1.2.2-1ubuntu0.10.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/alsa-ucm-conf/+bug/1937980/+attachment/5519903/+files/alsa-ucm-conf_1.2.2-1ubuntu0.10.debdiff

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Title:
  [SRU] the speaker doesn't work on Dell sdw sdca machine with
  kernel-5.13

Status in HWE Next:
  New
Status in alsa-ucm-conf package in Ubuntu:
  In Progress
Status in alsa-ucm-conf source package in Focal:
  In Progress
Status in alsa-ucm-conf source package in Hirsute:
  In Progress
Status in alsa-ucm-conf source package in Impish:
  In Progress

Bug description:
  [Impact]
  After upgrade the linux kernel to 5.13, the mixer names of rt1316 is changed, the current alsa-ucm-conf will fail to initialize that codec, then users can't output sound from internal speaker since the internal speaker is routed to the codec rt1316.

  [Fix]
  Backport 1 commit (https://github.com/alsa-project/alsa-ucm-conf/pull/109), after applying the commit, the ucm conf file doesn't initialize the codec with hardcoded mixer names anymore, it will check the existence of the mixer name first, then conditionally initialize the codec.

  [Test]
  sudo rm /var/lib/alsa/*; alsactl init; reboot, play the sound from internal speaker, the speaker works well.

  [Where problems will occur]
  The change only affects the rt1316 codec, so far, that codec only connects to the internal speaker on Dell soundwire sdca audio machine, so it could introduce regression on the internal speaker like users can't output sound via internal speaker anymore on the Dell soundwire sdca audio machine. But this possibility is very low since we already tested the commit on the Dell soundwire sdca audio machine. We tested it with old kernel and new kernel, all worked well.

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