You mentioned Bluetooth audio, that remind me that the testing alsa-lib
in the #66 has some problem, I just fixed it and uploaded a new version
to it, please try it. And testing alsa-lib is not SRUed yet, I plan to
SRU it with this bug: #1868210.

And Because the pulseaudio+ucm works greatly different from pulseaudio+non-ucm, 
most pulseaudio+ucm machines are headless embedded systems, it can't work as 
well as pulseauido+non-ucm on desktop system. To support the internal mic, 
Intel provided this ucm. If you prefer pulseaudio+non-ucm, you could add 
"options snd-hda-intel dmic_detect=0" in the /etc/modprobe.d/alsa-base.conf.

With the ucm, the internal mic and headset-mic belong to different
sources, and all output devices and input devices separate to different
profiles, that makes the auto-selection/switch among audio devices
nearly not work. And if you manually select an output device which is
not in the current profile, and two or more input devices are in the new
profile, you will see input device is changed when you select output
device. This is a pulseaudio bug maybe, if pulseaudio has fix, I will
backport it.

About the issue on google meet, it is a problem, do you also meet the
similar issue on other audio apps?

You received this bug notification because you are a member of Kernel
Packages, which is subscribed to alsa-lib in Ubuntu.

  [SRU] add ucm to make alsa/sof driver work under PA (variants of
  Lenovo X1 Carbon 7th, Dell cnl and cml machines)

Status in HWE Next:
  Fix Released
Status in alsa-lib package in Ubuntu:
Status in alsa-lib source package in Bionic:
  Fix Released
Status in alsa-lib source package in Eoan:
  Fix Released

Bug description:
  This ucm is only for Eoan and Bionic, for focal and future versions,
  we plan to integrate the ucm2 instead of this ucm, and the ucm2
  depends on the alsa-lib-1.2.1 and pluseaudio-v14, the ucm2 is under
  developing by the community, is not ready yet.

  In the oem project, we have a couple of Lenovo and Dell machines which
  connect the digital mic to PCH directly, this design needs the new
  sound driver soc/sof, and this driver can't work under pulseaudio
  automatically, we need to integrate the ucm for the driver, then the
  sof dirver could work under pulseaudio and gnome.

  This ucm is maintained by intel audio team, and it is not upstreamed
  and will not be upstreamed, since the community is developing the ucm2
  which is based on at least alsa-lib-1.2.1 and pulseaudio-v14.0 (still
  under developing), for bionic and eoan, we have to integrate this ucm
  since the alsa-lib version is too low. For focal and future version, we
  are going to integrate the ucm2 after the ucm2 is ready.

  This ucm is already verified in the oem project, now it is time to put it
  into the stock ubuntu. 

  These ucm files are backported from sof_ucm1 branch of

  [Test Case]
  Boot the eoan kernel or oem-osp1-bionic kernel, then check the log of
  pulseaudio, the ucm files are loaded successfully, then check the
  gnome-sound-setting, both output and input devices work well.

  [Regression Risk]
  Low, just add some new ucm files, and this will not affect other machines,
  and those new added ucm files are only used by specific machines which enable
  the sof driver.

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