Hi! I just want to chime in and document my workaround to use a generic
UVC webcam with a built-in mic.

I attach a screenshot showing both a "multichannel input" and
"microphone" once the UVC webcam is attached.

Notice the picklist still does not contain an item for the system built-
in [analog] microphone.

** Attachment added: "Sound setting missing picklist item for internal analog 

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  [MacBook2,1, SigmaTel STAC9221 A1, Mic, Internal] Recording problem

Status in alsa-driver package in Ubuntu:

Bug description:
  What you expected to happen

  Settings -> Sound -> Input  to list internal mic  (to test orange bars
  for recording from internal mic)

  What actually happened

  Settings -> Sound -> Input  only lists "Digital Input (S/PDIF)" (no
  bars move because no digital input connected)

  If possible, a minimal series of steps necessary to make it happen,
  where step 1 is "start the program"

  1. Open Settings
  2. Select Sound setting
  3. Select Input tab


  NOTE: ultimately, I want recording to work in apps such as Chrome,
  Firefox, Zoom, etc.

  NOTE 2: mic recording was last working in Ubuntu 18.04.x (32-bit)
  instance on *same* MacBook hardware (this installation went corrupt so
  I can't reverify it still works unfortunately - I will add to this
  issue if I get the cycles to reinstall or at your request)

  NOTE 3: interestingly enough, while using "ubuntu-bug" it was able to
  record from the mic on the 1st (of 2 tests the bug collector


  $ lsb_release -rd
  Description:  Ubuntu 18.04.4 LTS
  Release:      18.04

  from "apt list --installed"

  alsa-base/bionic,bionic,bionic,bionic,now 1.0.25+dfsg-0ubuntu5 all [installed]
  alsa-utils/bionic,bionic,now 1.1.3-1ubuntu1 amd64 [installed]

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 4.15.0-76.86-generic 4.15.18
  Uname: Linux 4.15.0-76-generic x86_64
  NonfreeKernelModules: lkp_Ubuntu_4_15_0_76_86_generic_63
  ApportVersion: 2.20.9-0ubuntu7.11
  Architecture: amd64
   /dev/snd/pcmC0D1c:   chinarut   1724 F...m pulseaudio
   /dev/snd/controlC0:  chinarut   1724 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Mar  6 22:41:25 2020
  InstallationDate: Installed on 2020-01-24 (42 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  PackageArchitecture: all
   PATH=(custom, no user)
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaRecordingTest: ALSA recording test through plughw:Intel successful
  Symptom_Card: Built-in Audio - HDA Intel
  Symptom_Jack: Mic, Internal
  Symptom_PulseAudioRecordingTest: PulseAudio recording test through 
plughw:Intel failed
  Symptom_Type: Only some of inputs are working
  Title: [MacBook2,1, SigmaTel STAC9221 A1, Mic, Internal] Recording problem
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/27/07
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MB21.88Z.00A5.B07.0706270922
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Mac-F4208CAA
  dmi.board.vendor: Apple Inc.
  dmi.board.version: PVT
  dmi.chassis.asset.tag: Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-F4208CAA
  dmi.product.family: MacBook
  dmi.product.name: MacBook2,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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