[ROG Strix G512LV_G512LV, Realtek ALC294, Speaker, Internal] No sound at all. (but headphones work)

[Denís]

It's a dualboot laptop and there's no problem with the audio in windows.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.4.0-47.51-generic 5.4.55
Uname: Linux 5.4.0-47-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.8
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: dnsei 2855 F.... pulseaudio
 /dev/snd/controlC0: dnsei 2855 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Fri Sep 18 00:41:04 2020
InstallationDate: Installed on 2020-09-17 (0 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH failed
Symptom_Card: Built-in Audio - HDA Intel PCH
Symptom_DevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: dnsei 2855 F.... pulseaudio
 /dev/snd/controlC0: dnsei 2855 F.... pulseaudio
Symptom_Jack: Speaker, Internal
Symptom_Type: No sound at all
Title: [ROG Strix G512LV_G512LV, Realtek ALC294, Speaker, Internal] No sound at all
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/13/2020
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: G512LV.310
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: G512LV
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrG512LV.310:bd07/13/2020:svnASUSTeKCOMPUTERINC.:pnROGStrixG512LV_G512LV:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnG512LV:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.family: ROG Strix
dmi.product.name: ROG Strix G512LV_G512LV
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.

[Launchpad Janitor (janitor)]

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