Two years and this is still a problem.
Yoga c930, running ubuntu 21.04 and 5.12.5

Microphone works in Win10, not in Linux.  Speakers have issues also.

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https://bugs.launchpad.net/bugs/1845797

Title:
  Microphone not detected Lenovo Yoga S940

Status in Linux:
  Confirmed
Status in alsa-driver package in Ubuntu:
  Confirmed
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Ubuntu 19.10 as well as 19.04 do not detect the microphone in Lenovo
  Yoga S940

  Attached the screen of gnome sound control panel.

  Inxi output:

  System:    Host: ******** Kernel: 5.3.0-13-generic x86_64 bits: 64 Desktop: 
Gnome 3.34.0 Distro: Ubuntu 19.10 (Eoan Ermine) 
  Machine:   Type: Laptop System: LENOVO product: 81Q7 v: Lenovo Yoga 
S940-14IWL serial: <root required> 
             Mobo: LENOVO model: LNVNB161216 v: SDK0J40709 WIN serial: <root 
required> UEFI: LENOVO v: AKCN34WW date: 06/12/2019 
  CPU:       Topology: Quad Core model: Intel Core i7-8565U bits: 64 type: MT 
MCP L2 cache: 8192 KiB 
             Speed: 1161 MHz min/max: 400/4600 MHz Core speeds (MHz): 1: 1161 
2: 1195 3: 1848 4: 976 5: 1041 6: 1209 7: 1061 
             8: 2229 
  Audio:     Device-1: Intel Cannon Point-LP High Definition Audio driver: 
snd_hda_intel 
             Sound Server: ALSA v: k5.3.0-13-generic
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  daniele    2239 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 19.10
  InstallationDate: Installed on 2019-09-12 (17 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
  MachineType: LENOVO 81Q7
  Package: pulseaudio 1:13.0-1ubuntu1
  PackageArchitecture: amd64
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.3.0-13-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 5.3.0-13.14-generic 5.3.0
  RelatedPackageVersions:
   linux-restricted-modules-5.3.0-13-generic N/A
   linux-backports-modules-5.3.0-13-generic  N/A
   linux-firmware                            1.182
  Tags:  eoan
  Uname: Linux 5.3.0-13-generic x86_64
  UpgradeStatus: Upgraded to eoan on 2019-09-21 (8 days ago)
  UserGroups: adm cdrom dip docker lpadmin microk8s plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 06/12/2019
  dmi.bios.vendor: LENOVO
  dmi.bios.version: AKCN34WW
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: LNVNB161216
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40709 WIN
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo Yoga S940-14IWL
  dmi.modalias: 
dmi:bvnLENOVO:bvrAKCN34WW:bd06/12/2019:svnLENOVO:pn81Q7:pvrLenovoYogaS940-14IWL:rvnLENOVO:rnLNVNB161216:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrLenovoYogaS940-14IWL:
  dmi.product.family: Yoga S940-14IWL
  dmi.product.name: 81Q7
  dmi.product.sku: LENOVO_MT_81Q7_BU_idea_FM_Yoga S940-14IWL
  dmi.product.version: Lenovo Yoga S940-14IWL
  dmi.sys.vendor: LENOVO

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