How do I troubleshoot vfio-pci drivers, or any driver for that matter? I've combed the boot log and found no errors. If no one can answer, could someone suggest another forum that might know?
My issue is exactly this, yet the solution didnt work. The title states the problem, and I've added the same pre-load instructions used. GPU Passthrough with vfio-pci still uses nouveau driver
When I blacklist the nouveau driver, no other driver will load. Not even for my primary display card. Soon as I remove that one arg in the grub boot params, the nvidia driver loads fine. The vfio modules are loaded. I just cant get the card to use them. Any ideas? Or any way to troubleshoot this? How does vfio-pci connect to the GPU device?
Maybe I can try using a pci-stub? PCI-STUB vs VFIO-PCI
dmesg | grep -i vfio has no output, so does that mean the driver is not loaded? Also dmesg | grep IOMMU has no output, but journalctl --no-pager | grep IOMMU says DMAR: IOMMU enabled.
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