I was able to get something on the screen when I added "pci=noacpi" (this was
without blacklisting amdgpu).

[Firmware Bug]: AMD-Vi: No southbridge IOAPIC fonud
AMD-Vi: Disabling interrupt remapping
platform USBC000:00 failed to claim resource 0: [mem ...]
acpi USBC000:00: platform device creation failed: -16
AMD-Vi: Unable to write to IOMMU perf counter.
...

I uploaded an attachment which shows the full output (I only typed out the
first several lines).

I might be able to bisect if needed. Does the image I uploaded show you
anything useful?