Are you using PCI passthrough in your T410 for any of the VMs, or spice qxl based graphics for both. Does the Thinkpad have optimus nvidia card?

I have a T520 with nvidia optimus, which I thought would be good for vfio pci passthrough based on r/vfio, because of it being mux based display, and nvidia having direct connection to external display. but for some reason couldn’t get it to work. I think it was because of uefi not being supported by the nvidia card, and bios mode having problem with vgaarb.