BTW, same with the older ATEM Mini (non-Pro)

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https://bugs.launchpad.net/bugs/1910537

Title:
  HDMI audio not working on Blackmagic Design ATEM Mini Pro ISO (video
  mixer)

Status in pulseaudio package in Ubuntu:
  Incomplete

Bug description:
  This is a complicated thing. I have a very specific problem with audio
  output on HDMI.

  I want to use an older notebook with Lubuntu 20.04 as a video source
  for libreoffice slides, videos etc. to feed them over HDMI into a
  Blackmagic Design ATEM Mini Pro ISO (video mixer) as one input.
  Configured on the desktop just like a second screen or beamer.

  Video works well and rock-stable, no problem at all.

  But not audio.

  Although I carefully configured audio with pavucontrol to be directed
  to the HDMI output, the ATEM switcher does not recognize it as an
  audio source (like when connecting a digital camera) and does not
  receive or indicate any audio input.

  Note:

  But when I use the very same computer, same HDMI cable, same video
  with a cheap chinese portable LCD screen with speakers (i.e. pull the
  cable from the ATEM and plug it into the screen) it immediately starts
  playing both video and audio. So there is evidence that the ubuntu
  notebook definitely passes it's sound to HDMI and there's really an
  audio signal on the HDMI.

  I've opened a bug at Blackmagic Design, and got their reply that they
  can't help and have never heard of such a problem before. Their guess
  is that the linux notebook is not setting EDID configuration correctly
  and thus not recognized by the ATEM, while the cheap LCD screen
  propably does not care about EDID and just plays everything, therefore
  a wrong EDID information would not matter.

  Although I have decades of experience with Linux, I am not too
  familiar with details of HDMI and the internals of the X11 driver, so
  I'm not sure where to start debugging, not even, whether this is a
  problem of Xorg/X11 or pulseaudio.


  I've checked this with another notebook with much more recent (intel)
  hardware, which offers dozens of HDMI audio options in the pavucontrol
  selection menu, but same problem: Video works, but the ATEM does not
  recognize it as a audio source.

  
  Blackmagic Design (they're good in Windows and MacOS, but not Linux) 
recommended to use an edid manager, whatever this means.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: xorg 1:7.7+19ubuntu14
  ProcVersionSignature: Ubuntu 5.4.0-58.64-generic 5.4.73
  Uname: Linux 5.4.0-58-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.14
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperMD5CheckResult: skip
  CompositorRunning: None
  CurrentDesktop: LXQt
  Date: Thu Jan  7 13:16:26 2021
  DistUpgraded: Fresh install
  DistroCodename: focal
  DistroVariant: ubuntu
  DpkgLog:
   
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 2nd Generation Core Processor Family Integrated Graphics 
Controller [8086:0106] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Acer Incorporated [ALI] 2nd Generation Core Processor Family 
Integrated Graphics Controller [1025:0742]
  InstallationDate: Installed on 2020-05-16 (235 days ago)
  InstallationMedia: Lubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  Lsusb:
   Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 001 Device 003: ID 04f2:b336 Chicony Electronics Co., Ltd 
   Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Acer AO756
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-58-generic 
root=UUID=a69345e2-b61e-4d25-baab-b23f75273af6 ro quiet 
cryptdevice=UUID=d132b97b-f47a-4432-88b5-42aca187b9ff:luks-d132b97b-f47a-4432-88b5-42aca187b9ff
 root=/dev/mapper/luks-d132b97b-f47a-4432-88b5-42aca187b9ff 
resume=/dev/mapper/luks-d132b97b-f47a-4432-88b5-42aca187b9ff splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/19/2012
  dmi.bios.vendor: Acer
  dmi.bios.version: V1.05
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: Mimic
  dmi.board.vendor: Acer
  dmi.board.version: Type2 - Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V1.05
  dmi.modalias: 
dmi:bvnAcer:bvrV1.05:bd07/19/2012:svnAcer:pnAO756:pvrV1.05:rvnAcer:rnMimic:rvrType2-BoardVersion:cvnAcer:ct10:cvrV1.05:
  dmi.product.family: Type1Family
  dmi.product.name: AO756
  dmi.product.sku: Type1Sku0
  dmi.product.version: V1.05
  dmi.sys.vendor: Acer
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.101-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.8-0ubuntu1~20.04.1
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2.6
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20200226-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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