[Bug 1936009] Re: [SRU] The internal mic of Dell Precision 5750 can't record sound

[Sebastien Bacher]

** Changed in: alsa-ucm-conf (Ubuntu Impish)
       Status: In Progress => Fix Committed

** Changed in: alsa-ucm-conf (Ubuntu Hirsute)
       Status: In Progress => Fix Committed

** Changed in: alsa-ucm-conf (Ubuntu Focal)
       Status: In Progress => Fix Committed

** Changed in: alsa-ucm-conf (Ubuntu Hirsute)
     Assignee: (unassigned) => Hui Wang (hui.wang)

** Changed in: alsa-ucm-conf (Ubuntu Focal)
     Assignee: (unassigned) => Hui Wang (hui.wang)

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https://bugs.launchpad.net/bugs/1936009

Title:
  [SRU] The internal mic of Dell Precision 5750 can't record sound

Status in HWE Next:
  New
Status in OEM Priority Project:
  New
Status in alsa-ucm-conf package in Ubuntu:
  Fix Committed
Status in alsa-ucm-conf source package in Focal:
  Fix Committed
Status in alsa-ucm-conf source package in Hirsute:
  Fix Committed
Status in alsa-ucm-conf source package in Impish:
  Fix Committed

Bug description:
  [Impact]
  After upgrade the linux kernel, the mixer names of rt715 is changed, the current alsa-ucm-conf will fail to initialize that codec, then users can't record sound from internal mic since the internal mic is routed to the codec rt715.

  [Fix]
  Backport 3 upstream commits, after applying these 3 commits, the ucm conf file dosn'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]
  run 'alsactl init 1' on the precision 5750 with old and new kernel, there is no error logs, use the internal mic to record sound, it could record successfully.

  [Where problems will occur]
  The change only affects the rt715 codec, so far, that codec only connects to the internal mic on Dell soundwire audio machines, so it could introduce regression on the internal mic like users can't record sound via internal mic anymore on the Dell soundwire audio machines. But this possibility is very low since we already tested these 3 commits on different Dell soundwire audio machines (latitude and precision). We tested it with old kernel and new kernel, all worked well.

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