Can't get HDMI audio working Ubuntu 22.04

[dwstix86]

Pavucontrol shows everything correctly set. Screenshots attached. Thanks for all your help.

[#&thj^%]

Will you please try turning this setting to off>>>Setting Digital Stereo (IEC958) Output to Off
Now check your HDMI

[dwstix86]

You’re not gonna believe this but I fixed it… if I set my refresh rate for my display to 30hz, the audio works. But if I set it any higher, for example, 60hz like I had it on, no audio…huh??

[MAFoElffen]

Dang. LOL. Now I have one more question to ask people...

[ajgreeny]

Great news! Strange solution, but I'm glad you found it!

Please mark as SOLVED from the Thread Tools menu up-top if this is now solved to your satisfaction. It is a great help to other users searching the forum.

[dwstix86]

Do you know why this worked or what happened?

[#&thj^%]

Do you know why this worked or what happened?

I'm glad you asked, This might be best documented in the PipeWire FAQ, so that it's documented somewhere that I frequent and brief HDMI (and possibly DisplayPort) audio drop-outs/cuts may be caused by the PCI-E link switching between signalling generations IE:

inxi -Alsa -j
Audio:
  Device-1: NVIDIA driver: snd_hda_intel v: kernel pcie: bus-ID: 4-1.2.1:4
    chip-ID: 17e9:4307 gen: 1 speed: 2.5 GT/s class-ID: 0a00 lanes: 8
    serial: 4307293310436 link-max: gen: 3 speed: 8 GT/s lanes: 16
    bus-ID: 01:00.1 chip-ID: 10de:10fa class-ID: 0403
  Device-2: AMD ACP/ACP3X/ACP6x Audio Coprocessor vendor: Lenovo driver: N/A
    alternate: snd_pci_acp3x, snd_rn_pci_acp3x, snd_pci_acp5x, snd_pci_acp6x,
    snd_acp_pci, snd_rpl_pci_acp6x, snd_sof_amd_renoir pcie: gen: 4
    speed: 16 GT/s lanes: 16 bus-ID: 06:00.5 chip-ID: 1022:15e2 class-ID: 0480
  Device-3: AMD Family 17h/19h HD Audio vendor: Lenovo driver: snd_hda_intel
    v: kernel pcie: gen: 4 speed: 16 GT/s lanes: 16 bus-ID: 06:00.6
    chip-ID: 1022:15e3 class-ID: 0403
  Device-4: DisplayLink UOEOS Laptop Dock type: USB
    driver: cdc_ncm,snd-usb-audio
  Sound API: ALSA v: k6.0.10-1-default running: yes
  Sound Server-1: PulseAudio v: 16.1 running: no
  Sound Server-2: PipeWire v: 0.3.61 running: yes
Swap:
  Kernel: swappiness: 60 (default) cache-pressure: 100 (default)
  ID-1: swap-1 type: partition size: 7.63 GiB used: 232 MiB (3.0%)
    priority: -2 dev: /dev/dm-1 maj-min: 254:1 mapped: system-swap label: N/A
Sensors:
  System Temperatures: cpu: 48.6 C mobo: N/A gpu: nvidia temp: 37 C
  Fan Speeds (RPM): N/A

And Lastly I have Nvidia in the works on mine so on some OS's Arch based and Debian based I'll have to set forcing power saving mode by driver setting. I'm adding "nvidia-smi --lock-memory-clocks / --reset-memory-clocks" to my TV on/off button script Fedora and openSUSE was a good to go for sound. (With this on Nvidia Driver param nosimplefb=1)


Try using ibt=off

[dwstix86]

I’m going to be honest…I have no idea what you just said lol. But a quick google search shows only nvidia uses ibt? I’m running amd cpu and gpu

[#&thj^%]

I’m going to be honest…I have no idea what you just said lol. But a quick google search shows only nvidia uses ibt? I’m running amd cpu and gpu

LOL, that's why I don't try to explain in general forums, older experienced user's pick up on the gist of it..
But while I have you will you try with your sound running, now change your refresh rate. It might stutter for a second but should still play sound.

[dwstix86]

When I switch to 60 the audio completely stops, resumes choppily when I switch back to 30 snd smoothed out snd becomes normal audio after about 5-10s