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Here's what *didn't* make any difference so far:
- cold reboot while making sure cable is attached
- put `options snd-hda-intel model=generic` in /etc/modprobe.d/*.conf

My problem is not:
- missing audio device

`aplay -l` has a `card 0: HDMI [HDA Intel HDMI]` in there

- muted audio

it's not just silent, e.g. mpv also fails to sync A/V, speeds through the video and reports underrun

- kernel driver failure to register audio

`journalctl --system` has a line `ops i915_audio_component_bind_ops`
it does *not* have a line about "couldn't bind", "No i915 binding" or "Cannot probe"

- nvidia

the Integrated Graphics Controller is the only VGA compatible controller here