[Bug 1805527] Re: [System Product Name, ATI R6xx HDMI, Digital Out, HDMI] Sound is distorted (as of a few weeks ago)

Does this issue go away if you boot back into the prior kernel version?

** Changed in: linux (Ubuntu)
Importance: Undecided => Medium

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Title:
[System Product Name, ATI R6xx HDMI, Digital Out, HDMI] Sound is
distorted (as of a few weeks ago)

Status in linux package in Ubuntu:
Incomplete

Bug description:
I use audio via DisplayPort. Until a few weeks ago, I got good
quality audio.

Now, I get really bad 8-bit-ish distorted audio.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.15.0-38.41-generic 4.15.18
Uname: Linux 4.15.0-38-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: mikel 2276 F.... pulseaudio
/dev/snd/pcmC1D3p: mikel 2276 F...m pulseaudio
/dev/snd/controlC1: mikel 2276 F.... pulseaudio
CurrentDesktop: XFCE
Date: Tue Nov 27 17:18:56 2018
InstallationDate: Installed on 2015-10-05 (1149 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:HDMI failed
Symptom_Card: Cape Verde/Pitcairn HDMI Audio [Radeon HD 7700/7800 Series] - HDA ATI HDMI
Symptom_Jack: Digital Out, HDMI
Symptom_Type: Digital clip or distortion, or "overdriven" sound
Title: [System Product Name, ATI R6xx HDMI, Digital Out, HDMI] Sound is distorted
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/21/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0703
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: P8Z68-V LX
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0703:bd10/21/2011:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP8Z68-VLX:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

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