Mar 21 18:57:22 user-ThinkPad-X1-Carbon-7th
[4806:4806:0321/] pa_operation is

Maybe the chromium is not compatible with the new pulseaudio (13.99)?
The api is changed in the PA-13.99 while the chromium still uses the old

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  Lenovo ThinkPad-X1-Carbon-7th Gen microphone doesnt work

Status in alsa-driver package in Ubuntu:

Bug description:
  On Focal Fossa the microphone is recognised but doesn't work.

  Chromium shows the microphone as present but off, and if it is
  renabled it goes off again after a couple of seconds.

  Chromium logs this error:

  [ 2149.047888] sof-audio-pci 0000:00:1f.3: error: no reply expected, received 
  [ 2149.177469] sof-audio-pci 0000:00:1f.3: firmware boot complete
  [ 2160.561825] sof-audio-pci 0000:00:1f.3: error: no reply expected, received 
  [ 2160.656755] sof-audio-pci 0000:00:1f.3: firmware boot complete
  [ 2414.391790] sof-audio-pci 0000:00:1f.3: error: no reply expected, received 
  [ 2414.487256] sof-audio-pci 0000:00:1f.3: firmware boot complete

  Mar 20 23:09:24 user-ThinkPad-X1-Carbon-7th
  [9531:9531:0320/] pa_operation
  is nullptr.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 5.4.0-18.22-generic 5.4.24
  Uname: Linux 5.4.0-18-generic x86_64
  ApportVersion: 2.20.11-0ubuntu20
  Architecture: amd64
   /dev/snd/controlC0:  user       1687 F.... pulseaudio
   /dev/snd/pcmC0D0p:   user       1687 F...m pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Mar 20 23:03:01 2020
  InstallationDate: Installed on 2020-03-11 (9 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200309)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaRecordingTest: ALSA recording test through plughw:sofhdadsp failed
  Symptom_Card: sof-hda-dsp - sof-hda-dsp
  Symptom_Jack: Black Mic, Right
  Symptom_Type: None of the above
  Title: [20R1000RUS, Realtek ALC285, Black Mic, Right] Recording problem
  UpgradeStatus: No upgrade log present (probably fresh install) 01/15/2020
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N2QET19W (1.13 )
  dmi.board.asset.tag: Not Available 20R1000RUS
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
dmi:bvnLENOVO:bvrN2QET19W(1.13):bd01/15/2020:svnLENOVO:pn20R1000RUS:pvrThinkPadX1Carbon7th:rvnLENOVO:rn20R1000RUS:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone: ThinkPad X1 Carbon 7th 20R1000RUS
  dmi.product.sku: LENOVO_MT_20R1_BU_Think_FM_ThinkPad X1 Carbon 7th
  dmi.product.version: ThinkPad X1 Carbon 7th
  dmi.sys.vendor: LENOVO
  mtime.conffile..etc.modprobe.d.alsa-base.conf: 2020-03-12T15:40:19.308712

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