Display output not switching to GPU#2 when booting and isolating GPU#1 for VM

[boggie1688]

Setup:
AMD 3950x
Asus PRO WS X570 Ace
Kingston 128GB ECC DDR4 3200
Asrock M2 VGA Siliconmotion SM750
Gigabyte 5700xt Gaming OC
Intel x520-DA2
Sun Oracle 375-3609-03 HBA
TrueNAS-SCALE-22.02.0

My Asrock M2 VGA is installed on the m.2 slot closest to the CPU. This is the slot that is controlled by the CPU and NOT the chipset. The 5700xt is installed on the very first PCIE 16x slot, closest to the CPU.

Inside of Truenas, I have the 5700xt setup for GPU Isolation. I have a WIn10 VM using this GPU for video rendering. When the system starts, the motherboard appears to prefer outputting a display signal over the 5700xt, and as Truenas boots then isolates the 5700xt for the VM, the output stops. However, Truenas doesn't seem to switch to the Asrock GPU.

I've checked and made sure the Asrock GPU works, by removing the 5700xt and booting. I confirmed Truenas does use the GPU to output a signal. And if I do have the 5700xt installed, I see that Truenas detects both GPUs because I have the option to isolate either one.

Is there an additional configuration step that I am missing?

 

[boggie1688]

Last thing I see on the 5700xt output before, I think, it gets isolated.

 

[angst911]

I think you need to check your BIOS preferences to set the proffered video adapter.