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

[Bryan Cebuliak]

If  igfx_off is  default, how / why is  it  on?
from
https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html
"...

intel_iommu=    [DMAR] Intel IOMMU driver (DMAR) option
                on
                        Enable intel iommu driver.
                off
                        Disable intel iommu driver.
                igfx_off [Default Off]
                        By default, gfx is mapped as normal device. If a gfx
                        device has a dedicated DMAR unit, the DMAR unit is
                        bypassed by not enabling DMAR with this option. In
                        this case, gfx device will use physical address for
                        DMA.
...


On Sat, 3 Jul 2021 at 01:25, Bryan Cebuliak <bryan.cebuliak at gmail.com>
wrote:

> 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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