fritzgeralds

@lnxd Got it working. Not sure if it was the vBIOS or the GPU audio but I've now survived several reboots and shutdowns with no Error 43 issues. Per your suggestion, I loaded GPU as 2nd graphics card (I also enabled the GPU audio to be safe) and dumped the rom with GPU-z. Removed VNC from VM used the rom I just dumped. VM booted right up with no issues. Attached second monitor for testing, rebooted, shutdown, still no issues. Thank you for your help on this. EDIT: For anyone wondering, I've loaded two VMs, one with Non-WHQL 2020-21.3.2 drivers and one with 2020-21.3.1 drivers. Both work fine and I'm able to shutdown/switch between both without issue.

Thanks. I grabbed the rom from techpowerup and figured something was up with mine when it was 100k(mine) vs 1m(theirs). I'll dump mine with GPU-z later tonight so I know it's for sure my specific card and see how that goes. Also, I've been passing the onboard sound and not the GPU sound. Could that be an issue?

@lnxd Here's the vBIOS that I'm using, not sure how to check it for errors or if it's complete. Oddly, I get Error 43's and brightened display when physically at the system however, I just booted up the VM and remoted in and there's no Error 43 under the Radeon driver and display looks fine. Sadly I didn't leave more than one monitor connected before heading to work. TUF-RX6800XT-O16G-GAMING_vbios.rom

I have that system shut down for the night as it's my secondary Unraid that I'm building. I'll boot it up after work tomorrow and post the vBIOS. As far as dumping it goes, I used SpaceinvaderOnes script found here via User Scripts. https://github.com/SpaceinvaderOne/Dump_GPU_vBIOS

Running almost the same specs as OP with differences being Dark Hero vs Hero and Asus Tuf OC 6800xt. Oddly, using UEFI I get locked to 640x480 and grayscale. Enabling CSM gets me back to full 2k resolution. VM is Q35 5.0 and boots/runs just fine so long as I don't install drivers. However, without Radeon drivers I'm unable to use more than one monitor. Installing them will give me 3 monitors and works great until I reboot. Then I drop back down to 1 monitor and display looks like the brightness is turned up (really light in color). I've messed with all the tips from OP as well as passed the dumped vBIOS to the VM. No bueno. On a side note... Who wants to trade a 6800xt for a 3080 :D.