Displayport Audio Only Works Occasionally

[obtusehash]

See https://askubuntu.com/questions/1226230/display-port-audio-pass-through-issue

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.3.0-51.44-generic 5.3.18
Uname: Linux 5.3.0-51-generic x86_64
ApportVersion: 2.20.11-0ubuntu8.8
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: alex 1483 F.... pulseaudio
 /dev/snd/controlC1: alex 1483 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Sat May 2 11:08:04 2020
InstallationDate: Installed on 2020-03-22 (40 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Symptom_Card: Hawaii HDMI Audio [Radeon R9 290/290X / 390/390X] - HDA ATI HDMI
Symptom_Jack: Digital Out, HDMI
Symptom_Type: Sound works for a while, then breaks
Title: [System Product Name, ATI R6xx HDMI, Digital Out, HDMI] fails after a while
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/03/2015
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0404
dmi.board.asset.tag: Default string
dmi.board.name: Z170-A
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0404:bd07/03/2015:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnZ170-A:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:
dmi.product.family: Default string
dmi.product.name: System Product Name
dmi.product.sku: SKU
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer