There’s no need for adding all of those flags to your kernel command line - just the ones below will do the job:

intel_iommu=on iommu=pt video=efifb:off modprobe.blacklist=snd_hda_intel,snd_hda_codec_hdmi,i915

If you need further IOMMU group separation and your motherboard doesn’t support ACS, then you can add:

pcie_acs_override=downstream