Public bug reported:
[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.
** Affects: alsa-ucm-conf (Ubuntu)
Importance: Undecided
Status: New
** Affects: alsa-ucm-conf (Ubuntu Focal)
Importance: Undecided
Status: New
** Affects: alsa-ucm-conf (Ubuntu Groovy)
Importance: Undecided
Status: New
** Also affects: alsa-ucm-conf (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: alsa-ucm-conf (Ubuntu Groovy)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1895669
Title:
Add more support to Lenovo ThinkStation P620
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