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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1895669 Title: Add more support to Lenovo ThinkStation P620 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-ucm-conf/+bug/1895669/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs