8845HS iGPU passthrough

[cshifer12]

I have GMKtec K8 plus. I have installed win11 in VM and followed this guide to passthrough igpu https://github.com/isc30/ryzen-gpu-passthrough-proxmox.

I have display connected to displayport.

At first i used RadeonResetBugFix but this made VM extremely slow start and down and it was not reliable. After VM shutdown it did not work.

I had passed through only 2 devices
hostpci0: 0000:c7:00.0,pcie=1,romfile=vbios_8845hs.bin,x-vga=1
hostpci1: 0000:c7:00.1,pcie=1,romfile=AMDGopDriver_8845hs.rom

Then i saw this comment https://github.com/isc30/ryzen-gpu-passthrough-proxmox/issues/112#issuecomment-2869638903

i added to passthrough list these and reinstalled win 11.
hostpci2: 0000:c7:00.5,pcie=1
hostpci3: 0000:c7:00.6,pcie=1

It was working without RadeonResetBugFix for one time only just like earlier. If win 11 VM shutdown or reboot host needed to reboot too. But it was fast. So i just did not install RadeonResetBugFix. And i just do not shutdown windows VM.

Today electricity went out and after it came. I can not see video output in monitor. If i connect to VM using RDP it shows everything is working. GPU is working. I have reinstalled GPU drivers but still. Here is a pic how it's shown on monitor. Tried other displayport cable but it's not a problem. Tried ubuntu live everything works fine.

How can i fix it?

Also if someone has similar hardware can this reset bug be fixed at all? I have tried vendor-reset but it also did not work.

 

[cshifer12]

It seems like something got messed up in windows because of sudden shutdown. Windows is so shit. I never ever had an issue of booting OS on linux because of sudden shutdown. I remember windows used to break because of this 15-20 years ago. It's been 15 years i have not used windows. I just installed it on new mini PC for passthrough functionality because of just one game friends play.
Now i installed windows 11 LTSC lite version and it all works.

Well works on first VM boot. If i shut it down then i can not start up it without host rebooting. Now i took a backup and if something goes wrong i'll quickly restore it.

If you can help with this reset bug that would be awesome. I have tried so many ways but nothing seems to work.