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