alright, here's the pa debug log where I did a fresh boot, set audio
from s/pdif to the hdmi audio output, then put the machine to sleep and
woke it, and then set the audio to the other hdmi output device after
the system switched them around.

** Attachment added: "pa.log.xz"

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  pulseaudio has is buggy with hdmi audio and sleep/wake

Status in pulseaudio package in Ubuntu:

Bug description:
  on a fresh Ubuntu 20.04 x64 install, I've noticed some troubling bugs
  with pulseaudio after putting my system to sleep and then waking it
  up. these bugs aren't present on a fresh boot, only after resuming
  from sleep:

  - it forgets which sound output device it's set to, and always reverse to the 
motherboard's S/PDIF output.
  - I have two devices connected to my video card, one is a displayport 
monitor, and one is a home theater receiver via HDMI. it confuses the two, and 
randomly switches which device it thinks is capable of surround sound.
  - it sometimes refuses to switch to the correct audio device, and just resets 
any choice back to the internal S/PDIF, until the system is rebooted.

  as you can imagine, this a pretty frustrating state of affairs.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: pulseaudio 1:13.99.1-1ubuntu3.4
  ProcVersionSignature: Ubuntu 5.4.0-40.44-generic 5.4.44
  Uname: Linux 5.4.0-40-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset 
  ApportVersion: 2.20.11-0ubuntu27.4
  Architecture: amd64
   /dev/snd/controlC1:  tessa      3387 F.... pulseaudio
   /dev/snd/pcmC1D7p:   tessa      3387 F...m pulseaudio
   /dev/snd/controlC2:  tessa      3387 F.... pulseaudio
   /dev/snd/controlC0:  tessa      3387 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Jul 22 18:38:42 2020
  InstallationDate: Installed on 2020-07-15 (7 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  SourcePackage: pulseaudio
  UpgradeStatus: No upgrade log present (probably fresh install) 04/18/2018
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 3503
  dmi.board.asset.tag: To be filled by O.E.M. 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:bvnAmericanMegatrendsInc.:bvr3503:bd04/18/2018:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnGRYPHONZ97:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: ASUS MB All Series
  dmi.product.sku: All
  dmi.product.version: System Version
  dmi.sys.vendor: ASUS

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