sound garbled in 20.10 with intel hdmi audio

[Tessa]

I've been having ongoing issues with pulse and my nvidia video card doing hdmi audio, so I thought I'd try using my builtin intel HDMI port for audio instead. However, when I switch the HDMI cable to that port, and select it in pulse, all the audio sounds crackly and garbled, like it's trying to play twice as many samples per second as it should. given this is with open source drivers, this may be a kernel issue and not a pulse issue, but I'm not sure how to fully determine that.

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: pulseaudio 1:13.99.2-1ubuntu2.1
ProcVersionSignature: Ubuntu 5.8.0-33.36-lowlatency 5.8.17
Uname: Linux 5.8.0-33-lowlatency x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu50.3
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: X-Cinnamon
Date: Wed Dec 30 18:05:38 2020
InstallationDate: Installed on 2020-07-15 (168 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: pulseaudio
UpgradeStatus: Upgraded to groovy on 2020-10-24 (68 days ago)
dmi.bios.date: 04/18/2018
dmi.bios.release: 4.6
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 3503
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: GRYPHON Z97
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3503:bd04/18/2018:br4.6:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnGRYPHONZ97:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: ASUS MB
dmi.product.name: All Series
dmi.product.sku: All
dmi.product.version: System Version
dmi.sys.vendor: ASUS
modified.conffile..etc.pulse.default.pa: [modified]
mtime.conffile..etc.pulse.default.pa: 2020-09-10T05:59:01.429804

[Tessa (unit3)]

note that this sounds like this bug upstream, but using that module option doesn't fix the issue:
https://bugzilla.kernel.org/show_bug.cgi?id=74861

[Tessa (unit3)]

note that if I set the output to 7.1 mode, it sounds identically garbled to 5.1 mode. but if I set it to Digital Stereo, no sound comes out at all.

[Tessa (unit3)]

Interestingly, if I run my monitor off my NVidia card, and the audio off the Intel HDMI, then the Intel audio works correctly. it's only when my display is connected to the Intel DisplayPort alongside my receiver on the Intel HDMI that it totally messes up.

[Daniel van Vugt (vanvugt)]

Thank you for reporting this bug to Ubuntu.
Ubuntu 20.10 (groovy) reached end-of-life on July 22, 2021.

See this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We appreciate that this bug may be old and you might not be interested in discussing it any more. But if you are then please upgrade to the latest Ubuntu version and re-test. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in.