Qemu VM nvidia pass through - black screen

[dagrichards]

i am running a VM on a truneas scale. Nvidia pass through is 'working' in that when I run nvidia-smi I see:
the expected output along with:
| Processes: |
| GPU GI CI PID Type Process name GPU Memory |
| ID ID Usage |
|=======================================================================================|
| 0 N/A N/A 2363 C /usr/bin/zmc 58MiB |
+---------------------------------------------------------------------------------------+
fwadmin@zonemindervm:~$
but the thumbnail and the live stream are both a solid black.

I have this working on a conventional server with ubuntu installed on to the metal, but I am trying to get away from that kind of deployment.

I am running ubuntu server 24, zoneminder 1.36.33
Nvidia drivers are : NVIDIA-SMI 535.183.01, | NVIDIA-HEADLESS 535.183.01, card is GeForce GTX 1060

I am seeing this in the logs:
Failed to get HW surface format for cuda.
Unable to receive frame : code -1094995529 Invalid data found when processing input.

Anyone have a clue to throw my way?