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

[Launchpad Bug Tracker]

This bug was fixed in the package alsa-ucm-conf - 1.2.2-1ubuntu0.4

---------------
alsa-ucm-conf (1.2.2-1ubuntu0.4) focal; urgency=medium

  * d/p/0001-ucm2-USB-Audio-Add-more-support-to-Lenovo-ThinkStati.patch
    Add MixerElem and proper PCM assignment to Lenovo P620 Main and Rear
    audio, respectively (LP: #1895669)

 -- Kai-Heng Feng <kai.heng.feng at canonical.com>  Tue, 15 Sep 2020
21:58:46 +0800

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

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Title:
  Add more support to Lenovo ThinkStation P620

Status in HWE Next:
  New
Status in OEM Priority Project:
  New
Status in alsa-ucm-conf package in Ubuntu:
  Fix Released
Status in alsa-ucm-conf source package in Focal:
  Fix Released
Status in alsa-ucm-conf source package in Groovy:
  Fix Released

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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