Hi mrmrv,
I have managed to get the passthrough working in Windows 11 by following a combination of 3 different guides:
Note: I have not tested with a physical monitor connected as I only access via RDP. And I do have a dummy monitor dongle plugged in but I don't know if it's required or not.
It's the most complexed passthrough I've done thus far as you need to do the following:
1) Configure a the passthrough with the rom files (in my case I used both the the video and the audio rom files)
2) Configure a fix for the AMD reset bug within the guest VM (I used the DevCon.exe to reset the 780m on VM shutdown)
3) Configure for the AMD reset bug on the Proxmox host (I used the hook script method).
These are the guides I used:
For the basic passthrough, including the rom files.
https://github.com/isc30/ryzen-gpu-passthrough-proxmox
This one explains the AMD reset bug, with 2 methods to overcome the problem.
https://github.com/xiongyw/docs/blo...rum-um880pro/pve-8.4-1_minisforum-um880pro.md
This is specifically for the AMD reset bug on the Proxmox host side.
https://github.com/isc30/ryzen-gpu-passthrough-proxmox/issues/131
I hope that helps, it's too late now, but I can post my config later if needed.
Good luck.