I'm on Ubuntu 20.04 and from the bootable image audio was picked up and microphone was working.
Kernel version was 5.4.0-26.
After some system updates the audio card is not recognized anymore.
I've collected output of alsa-info in working and non working situation, hoping it will be useful to debug the issue.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-33-generic 5.4.0-33.37
ProcVersionSignature: Ubuntu 5.4.0-33.37-generic 5.4.34
Uname: Linux 5.4.0-33-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.2
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Sat May 30 05:21:09 2020
InstallationDate: Installed on 2020-05-14 (15 days ago)
InstallationMedia: Kubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
MachineType: LENOVO 81Q9
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-33-generic root=UUID=f0119d7f-aa4a-4805-8645-f41a18fca029 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-5.4.0-33-generic N/A
linux-backports-modules-5.4.0-33-generic N/A
linux-firmware 1.187
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/09/2020
dmi.bios.vendor: LENOVO
dmi.bios.version: AUCN54WW
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: LNVNB161216
dmi.board.vendor: LENOVO
dmi.board.version: SDK0R32862 WIN
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 31
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo Yoga C940-14IIL
dmi.modalias: dmi:bvnLENOVO:bvrAUCN54WW:bd01/09/2020:svnLENOVO:pn81Q9:pvrLenovoYogaC940-14IIL:rvnLENOVO:rnLNVNB161216:rvrSDK0R32862WIN:cvnLENOVO:ct31:cvrLenovoYogaC940-14IIL:
dmi.product.family: Yoga C940-14IIL
dmi.product.name: 81Q9
dmi.product.sku: LENOVO_MT_81Q9_BU_idea_FM_Yoga C940-14IIL
dmi.product.version: Lenovo Yoga C940-14IIL
dmi.sys.vendor: LENOVO
This is alsa-info in the working configuration (Kubuntu 20.04 bootable image)