It’s weird. I just changed my mobo for a crosshair dark hero. Reinstalled a fresh install of Linux just to be safe. Reinstated my VM setup like before. Tried Manjaro and easymode Ubuntu. My 6800xt is detected with lspci as used by vfio-pci. Last attempt i used Mathias hueber guide, step by step. The VM boot but the only video output i got is this. That was with my old virtual drive i had from the last setup. If I try to make a new win10 VM i just get a white page instead of the blue of a windows install.
The rig : 5950x
Asus crosshair dark hero
32gig of 3600 MHz ram
4tb sabrent nvme drive (for my VMs virtual drives)
1tb we black nvme (host)
Lvl1 KVM switch dp1.4 2 screens
The thing is, this config was working just fine with my crosshair hero, i upgraded to the dark because my GF MOBO crapped on us and i gave her my hero and got the dark. I did the same setup i always do… It’s the first time i got something like that, I’m flabbergasted…
Edit. At least i know it’s not my card that went dead after the change. I just tested it in gaming on a bare metal windows emergency install, still game fine. No issues on that front
Edit 2. I toyed around with the above 4g transfer and the resizeble bar option in the bios. With it on without the bar, I get to the KVM splash screen but black screen after… With it off all the way, I still got the screen but black screen again… I double checked, IOMMU is on and srvio too. If i let it run, there is activity in my pinned cpus, just no signal.
Final edit, solved by Wendell, for some reason CSM enabled with resizable bar worked.