Bug#867548: New HDMI audio video IOMMU issues in Bullseye upgrade on Haswell are old

[Bryan Cebuliak]

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
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