[MS-7B51, Nvidia GPU 94 HDMI/DP, Digital Out, HDMI] No sound at all

[Dauphin]

$ lsb_release -rd
Description: Ubuntu Focal Fossa (development branch)
Release: 20.04

If I use xserver-xorg-video-nouveau/focal,now 1:1.0.16-1 amd64
there is no sound on Display port.
My graphic card is GTX 1650.

Please see bug 1859096. It work with 440 nvidia driver
but I want to use Nouveau driver.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.4.0-12.15-generic 5.4.8
Uname: Linux 5.4.0-12-generic x86_64
ApportVersion: 2.20.11-0ubuntu16
Architecture: amd64
CurrentDesktop: MATE
Date: Wed Feb 5 23:50:39 2020
InstallationDate: Installed on 2020-01-05 (31 days ago)
InstallationMedia: Ubuntu-MATE 20.04 LTS "Focal Fossa" - Alpha amd64 (20200104)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:NVidia failed
Symptom_Card: HDA NVidia - HDA NVidia
Symptom_Jack: Digital Out, HDMI
Symptom_Type: No sound at all
Title: [MS-7B51, Nvidia GPU 94 HDMI/DP, Digital Out, HDMI] No sound at all
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/21/2019
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1.50
dmi.board.asset.tag: Default string
dmi.board.name: MPG Z390 GAMING PLUS (MS-7B51)
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.:bvr1.50:bd02/21/2019:svnMicro-StarInternationalCo.,Ltd.:pnMS-7B51:pvr1.0:rvnMicro-StarInternationalCo.,Ltd.:rnMPGZ390GAMINGPLUS(MS-7B51):rvr1.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr1.0:
dmi.product.family: Default string
dmi.product.name: MS-7B51
dmi.product.sku: Default string
dmi.product.version: 1.0
dmi.sys.vendor: Micro-Star International Co., Ltd.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.