in my case i use nomachine, and nomachine can utilize the GPU for hardware encoding, however it cannot stretch to 2 monitor afaik.
i have an iGPU passthrough to a Linux vm, and two nvidia passthrough to two windows 11, all with nomachine and...
i have this same as yours
/etc/modprobe.d/blacklist-nvidia.conf
blacklist nouveau
blacklist nvidia
blacklist nvidiafb
blacklist rivafb
blacklist snd_hda_intel
nvidia card is easy to passthrough without additional setting, i am passing through it to a windows 11 VM since PVE8 and now PVE9.
simply adding it to your VM should work just fine.
did you by any chance blacklisted i915 driver?
another potential problem is to check your bios, some motherboard default setting will disable igpu when a PCIE GPU is installed.
for those using latest kernel in Linux VM and failed with iGPU passthrough, read here
https://forum.proxmox.com/threads/proxmox-9-gpu-pass-through.169151/post-787947
you need to get the i915_vbt...
i am not using AMD so not sure if what i did for intel can apply for AMD, or not. below was my step
https://forum.proxmox.com/threads/alderlake-direct-passthrough-to-linux-vm-is-working-with-hdmi-output.138049
although when i wrote it was using...