UEFI boot doesn’t suffer from this problem, since it does away with the legacy VGA interface. From what I understand, the video cards in the host and guest can end up both contending to own the VGA resources, which can cause a deadlock on boot. When a Sierra guest loads its video driver during boot, my Proxmox host hangs, and the screen fills with black and white bars. One of the problems with legacy BIOS boot and GPU passthrough is VGA arbitration. I managed to fix these by updating to UEFI boot with Clover. However, I had some real struggles getting the graphics card passthrough to work reliably. Since then, I’ve been using it as my daily-use desktop, and it has generally been working out great for me. My previous Proxmox post described how to install Sierra into Proxmox using the Enoch bootloader (SeaBIOS boot).
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