Another instance of this bug:
https://www.reddit.com/r/archlinux/comments/ghozc1/cantt_get_audio_from_intel_graphics_hdmi_out/

Dear maintainers, maybe it's time to fix the IOMMU driver? Or, if IOMMU
maintainers are indeed unreachable, maybe ALSA maintainers can detect
this condition (iommu on, Haswell HDMI) and at least emit a warning in
the log referencing this bug and a possible workaround?

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https://bugs.launchpad.net/bugs/1428121

Title:
  Intel HDMI Audio not working with IOMMU enabled

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