<div dir="ltr">So I tried a BIOS VM, freshly created from scratch. Reinstalled Windows 10 and was able to get the NIC and USB passthrough working fine. When I removed the VNC Graphic device and Video Display, then add the NVIDIA card (graphics and audio) the machine doesn't boot and needs to be forced off. Even re-adding the VNC Graphic device and Video Display (so I can see what is going on) fixes it allowing it to boot (even though the GPU devices are still present). I can confirm when it boots normally that my TightVNC connection works. But I'm blind when just the NVIDIA devices are present so no clue WHY it's not booting. </div><div class="gmail_extra"> <div class="gmail_quote">On Mon, Jul 25, 2016 at 6:11 PM, Samuel Holland <<a href="mailto:samuel@sholland.org" target="_blank">samuel@sholland.org</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On 07/25/2016 04:29 PM, Steven Bell wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> On Mon, Jul 25, 2016 at 5:23 PM, Philip Abernethy wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> Did you make sure that the card actually supports UEFI mode? Because my GTX 660 didn't. But the OS (Arch in my case) would happily boot with the UEFI set to UEFI-only mode and the card would silently run in legacy mode. I had to update the card's ROM. I used nvflash to check the card's UEFI capability and update the ROM. </blockquote> Interesting. I'll give the nvflash a try and post back my results. </blockquote> Note that you do not need to actually flash a new ROM to the card to use it with qemu/KVM. You can just specify a path to the ROM file in your XML. This is much safer than flashing your card, especially if there is no UEFI-capable firmware available for your specific video card model. Samuel </blockquote></div> </div>