Daryl Williams
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Daryl Williams's post in 3 GPU passthrough, only 2 passing through was marked as the answerI found that other people have reported this problem. It appears to be something to do with the HDMI port which doesn't passthrough. I swapped to using display port and it passed through straight away.
It's strange as the 2 other GPU cards passthrough via HDMI but the GTX1660ti does not. Cable and port are fine as Unraid boots on the card as it's the primary GPU in BIOS.
On 10/9/2019 at 7:47 AM, stvwndr219 said:
SOLVED:
The issue appears to be with using an HDMI cable on the VM. I got my DisplayPort to HDMI cable out and converted one of the DisplayPort slots on the 1080 Ti to HDMI on my monitor and we are good to go. I do wonder if passing through HDMI audio from the GPU means you can't use the HDMI output due to the HDMI audio being on the same IOMMU group as the GPU. Not sure, but it works now.