PeteManhardt

SOLVED! Thanks to Sparkie's post referenced below I was able to resolve my issue by doing the following: I changed my xml as per his post with the multifunction tag with the audio occupying the same bus slot though I didn't have the ROM entry, then changed Unraid's Flash to boot legacy instead of UEFI, then changed the ASUS bios to boot CSM for both legacy & UEFI & then for legacy for all listed items except for the Flash disk. Unraid booted with no errors which I could watch from the iKVM, then started up my Macinabox vm again with no errors and l could see it on the display via the Vega, then logged into to the vm from my Win10 PC via splashtop and it worked showing the Vega in the system info graphics output! Now, I know of course without that ROM entry, I have an issue whenever I stop the vm, the Vega fans go on full blast and I get an execution error when I attempt to restart the vm again which I resolve by restarting the unraid server. For me/my son, this is the only vm we'll be hosting on it as he's getting into video editing/rendering; so, the vm has all the cpu cores and RAM allocated anyways; thus, not a big deal to have to occassionally restart unraid since it's connected to a UPS/whole house generator and will be running non-stop otherwise. If it becomes a bigger deal, then we'll tackle that. He's happy, that's all that matters

I was considering trying to figure out how to get VNC working with a GPU passthrough, but hadn't tried it; so, thanks for sharing you weren't successful. I've an onboard ASPEED vga which I'm using via a iKVM console and a single AMD Vega 56 GPU that Catalina supports that's connected to a display which shows no output during unraid boot or at anytime through the vm startup, etc. I'm not seeing any hardware conflicts in the logs. On you thought of PCIe version, I know the slot the VGA is using (the only PCIe slot being used) is a full PCIe 3.x slot; so, I'm stumped. The thing is as soon as I edit the XML to remove the Vega and use VNC, it works really well. I'm simply passing the Vega to get Catalina to recognize it to use it for video editing for my teenage son as a birthday 'gift'; days later, it's sort of backfiring on me Anyways, thanks for the reply!

Sorry to hijack this oldish thread, but I'm having a similar issue with the Macinabox Catalina vms which works really well using the VNC viewer, but after I passthrough my AMD Vega 56 GPU, my console turns black and I can't get the MacOS vms to see/use the GPU. The vms says it started, of course, I can't see the Mac boot loader and once it's up, I can't splashtop into the Mac as it never becomes available in the splashtop app only when I use VNC, but then of course it's not passing through the GPU. I've manually edited the XML to ensure all the edited changes are correctly reflected in the XML from using the form mode and have read/tried all the other posted tips/possible solutions to no joy. I'm really trying/struggling...and very appreciative of any assistance!! Here's my diagnostics with the anonymized XML embedded.server1-diagnostics-20200727-1918.zip