more possibly relevant IOMMU video audio and passthrough issue links: Easy ACS kernel patch guide for Ubuntu 20.04 https://www.youtube.com/watch?v=JBEzshbGPhQ
https://forum.level1techs.com/t/intel-graphics-hdmi-audio-fails-after-enabling-intel-iommu-on/168827 kvm-gpu-passthrough-on-debian-buster.md https://gist.github.com/davesilva/445276f9157e7cb3a4f6ed2fe852b340
