[Bug 1895669] Re: Add more support to Lenovo ThinkStation P620

[Kai-Heng Feng]

debdiff for focal

** Patch added: "alsa-ucm-conf_1.2.2-1ubuntu0.4.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/alsa-ucm-conf/+bug/1895669/+attachment/5411202/+files/alsa-ucm-conf_1.2.2-1ubuntu0.4.debdiff

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https://bugs.launchpad.net/bugs/1895669

Title:
  Add more support to Lenovo ThinkStation P620

Status in HWE Next:
  New
Status in alsa-ucm-conf package in Ubuntu:
  New
Status in alsa-ucm-conf source package in Focal:
  New
Status in alsa-ucm-conf source package in Groovy:
  New

Bug description:
  [Impact]
  After upgrading the audio device firmware and doing more testing, we found some new audio issue on Lenovo P620:
  1) Rear mic doesn't work.
  2) Front and rear mic/line-in don't use hardware gain to control capture volume.

  [Fix]
  For 1), add proper PCM stream assignment to the rear microphone.
  For 2), add MixerElem to let alsa-lib and PulseAudio to pick correct mixer to change HW gain.

  [Test]
  With the new UCM applied, rear mic starts to work, and PulseAudio can control the hardware gain.

  [Regression Potential]
  The system hasn't hit the market so there's no chance to regression any system in the wild.

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