Public bug reported:

Hi. I am new to ubuntu. I had sound at first then it just disappeared. I
have tried to fix it. Note: When I woke ubuntu from sleep it would have
no sound until I rebooted.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
Uname: Linux 5.6.0-050600-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.10
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  alan      47711 F.... pulseaudio
 /dev/snd/controlC0:  alan      47711 F.... pulseaudio
 /dev/snd/pcmC0D1p:   alan      47711 F...m pulseaudio
 /dev/snd/controlC2:  alan      47711 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed Oct 28 17:32:40 2020
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:SB failed
Symptom_Card: Built-in Audio - HDA ATI SB
Symptom_DevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  alan      47711 F.... pulseaudio
 /dev/snd/controlC0:  alan      47711 F.... pulseaudio
 /dev/snd/pcmC0D1p:   alan      47711 F...m pulseaudio
 /dev/snd/controlC2:  alan      47711 F.... pulseaudio
Symptom_Jack: SPDIF Out, Internal
Symptom_Type: No sound at all
Title: [MS-7693, Realtek ALC1150, SPDIF Out, Internal] No sound at all
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/21/2015
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: V22.4
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: 970 GAMING (MS-7693)
dmi.board.vendor: MSI
dmi.board.version: 4.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: MSI
dmi.chassis.version: 4.0
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrV22.4:bd12/21/2015:svnMSI:pnMS-7693:pvr4.0:rvnMSI:rn970GAMING(MS-7693):rvr4.0:cvnMSI:ct3:cvr4.0:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: MS-7693
dmi.product.sku: To be filled by O.E.M.
dmi.product.version: 4.0
dmi.sys.vendor: MSI
mtime.conffile..etc.modprobe.d.alsa-base.conf: 2020-10-28T16:45:58.098082

** Affects: alsa-driver (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1901929

Title:
  [MS-7693, Realtek ALC1150, SPDIF Out, Internal] No sound at all

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