PCI/internal sound card not detected

[Daniele Dellafiore]

Something got wrong with audio on my laptop, where for the first 6 weeks using Focal it was working ok, both sound and mic.

Lenovo Yoga S940
Intel® Core™ i7-1065G7 CPU @ 1.30GHz × 8
Mesa Intel® Iris(R) Plus Graphics (ICL GT2)
Ubuntu 20.04 focal

$ uname -r
5.4.0-31-generic

$ lspci | grep Audio
00:1f.3 Multimedia audio controller: Intel Corporation Smart Sound Technology Audio Controller (rev 30)

$ aplay -l
aplay: device_list:274: no soundcards found...

$ cat /proc/asound/cards
--- no soundcards ---

This got worst from this:
https://bugs.launchpad.net/linux/+bug/1845797

But for a while, all focal kernel until the last one, it was working properly, now the whole audio is gone despite lspci still see the Audio Controller.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.4.0-31.35-generic 5.4.34
Uname: Linux 5.4.0-31-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue May 26 22:57:56 2020
InstallationDate: Installed on 2020-04-16 (40 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200415.2)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Title: PCI/internal sound card not detected
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/21/2019
dmi.bios.vendor: LENOVO
dmi.bios.version: BQCN29WW
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 S940-14IIL
dmi.modalias: dmi:bvnLENOVO:bvrBQCN29WW:bd10/21/2019:svnLENOVO:pn81Q8:pvrLenovoYogaS940-14IIL:rvnLENOVO:rnLNVNB161216:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrLenovoYogaS940-14IIL:
dmi.product.family: Yoga S940-14IIL
dmi.product.name: 81Q8
dmi.product.sku: LENOVO_MT_81Q8_BU_idea_FM_Yoga S940-14IIL
dmi.product.version: Lenovo Yoga S940-14IIL
dmi.sys.vendor: LENOVO