PCI/internal sound card not detected

[Johannes Pitz]

After installing a graphics card, I cannot get the sound output to work anymore.
I initially thought it would be a bios problem (https://askubuntu.com/questions/18417/no-sound-after-installing-a-new-graphics-card) but there aren't any settings I haven't tried to modify already.
Is there a chance to find the old internal sound "card" from the main board that I have been using before installing the GPU?

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.11.0-37.41~20.04.2-generic 5.11.22
Uname: Linux 5.11.0-37-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.20
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: johannes 1537 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed Oct 13 15:58:53 2021
InstallationDate: Installed on 2021-10-08 (5 days ago)
InstallationMedia: Ubuntu 20.04.3 LTS "Focal Fossa" - Release amd64 (20210819)
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: 09/04/2017
dmi.bios.release: 5.12
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1.00
dmi.board.asset.tag: Default string
dmi.board.name: Z370 PC PRO (MS-7B49)
dmi.board.vendor: Micro-Star International Co., Ltd.
dmi.board.version: 1.0
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Micro-Star International Co., Ltd.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.00:bd09/04/2017:br5.12:svnMicro-StarInternationalCo.,Ltd.:pnMS-7B49:pvr1.0:skuDefaultstring:rvnMicro-StarInternationalCo.,Ltd.:rnZ370PCPRO(MS-7B49):rvr1.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr1.0:
dmi.product.family: Default string
dmi.product.name: MS-7B49
dmi.product.sku: Default string
dmi.product.version: 1.0
dmi.sys.vendor: Micro-Star International Co., Ltd.