So I've tried for hours and hours and hours to get this passthrough to work and it just never fucking shows any video at all through the GPU. I've tried with two GPUs. I'm really really hoping someone here can throw me a bone and help me troubleshoot, I feel like I'm shouting into the void and have no idea what else to try. I feel like I've tried literally every single possible option of settings and it just doesn't work.

 

I recently got a new GPU and was able to slot it in to my 6.11 build pretty seamlessly. It worked great in my existing VM and all was good. Well then 6.12 released and I messed something up when transferring the vdisk off my cache to convert it to ZFS. Well that's annoying but all my data is still there otherwise so just needed a new OS set up. However now I can't for the life of me figure out how to get the passthrough working again. I've tried also going back to the old GPU and getting that working and now that doesnt even work.

 

This is my running ist of things I've tried:

All my BIOS settings are fine CSM and IOMMU are enabled

The vfio log says everything is succesfully attatched

Adding multifunction='on' and changing the sound card to match the bus of the video card

Tried OVM/SeaBIOS - No idea which one is better

Tried UEFI/Legacy - I don't know which one is better or not, literally will be two forum replys with completely different info on which one works better

Tried no vBios, dumped vBios and one from techpowerup with the header removed (wasnt 100% sure I have the TUF 4090 and Techpowerup only had one for the strix but I assumed they were close enough).

Have a HDMI and DP monitor attatched to GPU (I read somewhere it might need hdmi?)

Syslinux:

kernel /bzimage
append initrd=/bzroot vfio_iommu_type1.allow_unsafe_interrupts=1 pcie_acs_override=downstream,multifunction video=efifb:off

 

Everything seems to launch fine, and I can access the VM from RDP, but the GPU is not recognized by the VM and nothing shows up on any of the monitors.

 

Thanks for any help you can provide.

 

Diagnostics for Arch is 1950

Diagnostics for W10 is 1956

 

tower-diagnostics-20230625-1950.zip tower-diagnostics-20230625-1956.zip

6.12 is just completely fucked with GPU passthrough. I've tried everything as well and just can't get it to work, whereas it worked so easily on previous versions. I've tried everything on your list as well and found zero success.

I have added a bug report for this issue, if others who are also affected by this want to comment there, i am sure this issue will get more attention and hopefully a solution!