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[–] ttyS0 0 points 3 points (+3|-0) ago 

You should check first whether your BIOS actually enables IOMMU at all or if manually enabling works. If you see no mention of “AMD-Vi”, you should try adding the boot parameters iommu=pt iommu=1 temporarily for an AMD CPU. If still nothing pops up, your CPU/chipset most likely doesn’t support IOMMU.

Also GPU passthrough won’t work using a single GPU (you can’t force Linux to free the GPU it booted with). If you can’t force the system to boot up using the processor-integrated GPU, you can’t share the dedicated one.