GPU Passthrough no longer working after upgrade to 6.12.3

[constellation]

Made a huge jump from 6.9.2 to 6.12.3 and GPU passthrough is no longer working.

 

All I'm getting is a black screen. No errors in the logs other than "char device redirected to /dev/pts/3 (label charserial0)" which I have no clue what it even means.

 

The VM is: Windows 10 - HD 6870

 

Checked everything that I previously needed for GPU passthrough including:

- bind GPU to vfio

- set GPU to multifunction on

- set audio portion of GPU to same bus and function=1

- specifically adding a VBIOS (I previously didn't need to do this at all on 6.9.2 but I tried anyway, didn't help at all so I removed it)

- IOMMU groups are good and isolating the GPU its own group

 

What's strange is that if I set up VNC as the primary GPU and my physical GPU as the secondary GPU, then passthrough works. I obviously don't want to set it up that way though and would hate as a workaround.

basementnas-diagnostics-20230730-1551.zip

Edited July 30, 2023 by constellation

[sublimejackman]

SAME! Completely broken, can no longer use my GPU in VMs. This completely breaks my use case of Unraid.

[Zeze21]

Same here:

in 6.12.3 the gpu passthrough seems to be at least partly broken.

Exact same experience: If have my first GPU virtual the second one (real) will pass through without any problem whatsoever.

I have 4 GPUs all NVIDIA 2x 1030, 1x 2070, 1x 3060. The two 1030 work fine as passthrough. I have only troubles with the 2070 and the 3060 (which at least one of them is the GPU i really want to passthrough)

Due to my setup I am willing to test whatever scenario to get this working again.

[Zeze21]

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!

 

 

[Teth]

Hi, I finally did the jump from 6.9 to 6.12, and also broke all my video passthru on the VMs.

Tried everything, including changing types of machines, re-installing the OS's, but nothing... just disastrous.

Did anyone get their VM's to do video pass through?

 

It looks like putting the video card as a second display kinda works with one of my amd cards.

 

Greatly appreciate any solutions.

I may have to role back to 6.9

[SimpleDino]

I have the same issue since the upgrade, all of my VM's with GPU passthrough don't work anymore.

I can access them through RDP, anydesk etc. but not with sunshine/moonlight without proper encode/decode function.

 

I can see the GPU's in all device managers and ...(kinda working?!)  but none outputs any display to monitors.

 

Have any of you found any solution to this?

Br,

[AT123454321]

same here. 2080ti not passing through or passing through randomly.

 

Any timeline for when we will have a fix? not workarounds (I saw some threads where it was recommended to load some 6.11 into 6.12 in order to fix it.)

[sonisame]

Its busted, I have two full licenses and none of the VMs can pass through on two machines.. Shame for a paid software($$$) to not have it figured out for such a long time, 

Who is still paying for a piss- poorly supported platform.

 

Sam

[JonathanM]

Works fine on some hardware, but not others. Unraid can't control which hardware you have, and making recommendations is no good, things change too quickly. Best bet is to copy the hardware setup of someone who currently has it working.

[SBlackfoot]

Was there ever a solution for this one? I recently updated from 6.9.2 to 6.12.6 and have a similar problem with a similar GPU (an old HD 7850) on my Windows 10VM. I'm planning on starting my own thread but this is just too similar to not inquire.

[AT123454321]

In my case I think there is mostly a hardware issue that becomes apparent with the Unraid update. I have an Asrock MB which doesn’t handle well pci lanes allocations between an M2 slot and the GPU slot. I removed the M2 from its (main) slot and things became better. I still need to boot several times before pass through properly gets acknowledged but at least it’s a known predictable issue.