Some additional info for bug report:

$ ls /lib/modules/5.3.0-51-generic/kernel/sound/drivers
mpu401  snd-aloop.ko  snd-mts64.ko          snd-virmidi.ko
opl3    snd-dummy.ko  snd-portman2x4.ko     vx
pcsp    snd-mtpav.ko  snd-serial-u16550.ko


~$ ls /lib/firmware/cs46xx/
ba1  cwc4630  cwcasync  cwcbinhack  cwcdma  cwcsnoop

~$ modinfo snd-cs46xx
filename:       
/lib/modules/5.3.0-51-generic/kernel/sound/pci/cs46xx/snd-cs46xx.ko
license:        GPL
description:    Cirrus Logic Sound Fusion CS46XX
author:         Jaroslav Kysela <pe...@perex.cz>
firmware:       cs46xx/cwcdma
firmware:       cs46xx/cwcbinhack
firmware:       cs46xx/cwcsnoop
firmware:       cs46xx/cwcasync
firmware:       cs46xx/cwc4630
srcversion:     11FF4360F4C97088F132FB1
alias:          pci:v00001013d00006004sv*sd*bc*sc*i*
alias:          pci:v00001013d00006003sv*sd*bc*sc*i*
alias:          pci:v00001013d00006001sv*sd*bc*sc*i*
depends:        snd-pcm,snd-ac97-codec,snd,snd-rawmidi,gameport
retpoline:      Y
intree:         Y
name:           snd_cs46xx
vermagic:       5.3.0-51-generic SMP mod_unload 
signat:         PKCS#7
signer:         
sig_key:        
sig_hashalgo:   md4
parm:           index:Index value for the CS46xx soundcard. (array of int)
parm:           id:ID string for the CS46xx soundcard. (array of charp)
parm:           enable:Enable CS46xx soundcard. (array of bool)
parm:           external_amp:Force to enable external amplifier. (array of bool)
parm:           thinkpad:Force to enable Thinkpad's CLKRUN control. (array of 
bool)
parm:           mmap_valid:Support OSS mmap. (array of bool)

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https://bugs.launchpad.net/bugs/1876555

Title:
  Apps cannot retrieve internal mic input

Status in alsa-driver package in Ubuntu:
  New

Bug description:
  Could be pulseaudio, alsa-driver, or
     ~$ /usr/bin/gnome-control-center sound input

  Dell Vostro 2520 dual-boot laptop  
  Intel Corporation 7 Series/C216 Chipset Family High Definition Audio 
Controller (rev 04)  
  2- Cirrus Logic High Definition Audio, model CS4213  
  Ubuntu 18.04.4 LTS  
  Windows 10 Home, v. 1903, bld 18362.778  
  Skype 8.59 (Ubu & Win)  
  Zoom (cloud meetings) 5.0.3x (Ubu), 5.0.1x (Win)
  pulseaudio 1:11.1-1ubuntu7.5 
  alsa-driver -- package could not be found: 
      ~$ apt-cache policy alsa-driver
      N: Unable to locate package alsa-driver
      
      Does this help? /lib/modules/5.3.0-51-generic/kernel/sound/drivers

  
  In Settings > Sound > Input, the On/Off [unmute/mute] setting *appearance* is 
preserved over reboots and awakenings from sleep, but the mic input sound is 
always muted despite the control still being set to On (unmute). Clicking mute 
(Off), then unmute (On) restores mic input, as shown by the level meter 
tracking input sounds.

  However, Skype 8.59x and Zoom 5.0.3x cannot receive sound inputs
  *despite* their sound level meters (in their respective sound
  settings) registering changing input levels. The Skype test call does
  not work. I opened a Zoom meeting with my wife on her Win 10 computer.
  I could see and hear her, and she could see but not hear me.

  On this dual-boot laptop, Skype 8.59x fails the test call under
  Windows 10 Home.

  The Sound Recorder app can successfully record mic input and play it
  back. pavucontrol shows input on its level meter.

  Notes:

  +   ~$ /usr/bin/gnome-control-center sound input
      (gnome-control-center:17284): sound-cc-panel-WARNING **: 16:48:28.795: 
Couldn't find a stream 
      from the active input

  +   Many days searching the internet and AskUbuntu have not produced a 
solution that works. (For 
      what it is worth, many posters have reported that sound became 
dysfunctional after upgrading 
      to 18.04 or 18.04.4.)

  +   I have added the snd-cs46xx kernel module and firmware to get around 
driver licensing issues 
      following the instructions at https://wiki.debian.org/snd-cs46xx, Debian 
8.

  +   I have added these lines to /etc/modprobe.d/alsa-base.conf :

      options snd-hda-intel model=dell-vostro-2520  
      options snd-hda-intel dmic_detect=0 

  +   In PulseAudio Volume Control I have set the following:

      Input Devices Port: Internal Microphone
      Output Devices Port: Speakers

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 5.3.0-51.44~18.04.2-generic 5.3.18
  Uname: Linux 5.3.0-51-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.9-0ubuntu7.14
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  hfinger    4047 F.... pulseaudio
   /dev/snd/pcmC0D0c:   hfinger    4047 F...m pulseaudio
   /dev/snd/pcmC0D0p:   hfinger    4047 F...m pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Sun May  3 16:52:35 2020
  InstallationDate: Installed on 2020-04-15 (17 days ago)
  InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 
(20200203.1)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaRecordingTest: ALSA recording test through plughw:PCH failed
  Symptom_Card: Built-in Audio - HDA Intel PCH
  Symptom_Jack: Mic, Internal
  Symptom_Type: None of the above
  Title: [Vostro 2520, Cirrus Logic CS4213, Mic, Internal] Recording problem
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/25/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 0FWKV7
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A05
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: 
dmi:bvnDellInc.:bvrA05:bd01/25/2013:svnDellInc.:pnVostro2520:pvrNotSpecified:rvnDellInc.:rn0FWKV7:rvrA05:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: Vostro 2520
  dmi.product.sku: To be filled by O.E.M.
  dmi.product.version: Not Specified
  dmi.sys.vendor: Dell Inc.
  mtime.conffile..etc.modprobe.d.alsa-base.conf: 2020-05-01T13:58:36.978996

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