[SOLVED] GPU passthrough with RX460 crashes complete Unraid server

[Umise]

Hi together,

 

for quite a while now I am trying to passthrough my Gigabyte RX 460 2GB (primary GPU) to a VM.

I was able to made some significant progress, from only having a black screen over blurred images to a finally working output that crashes the complete server after while (in a 5 - 15 minutes time span)...

But at this point I am stuck completely as I tried everything what I have read in the forum or seen in videos without getting a stable system neither with Win10 VM nor with my OpenSuse VM...

So I hope I just overlooked an obvious issue 😋

The system that I use is based on a Dell T20 where I added my RX460 to it as it requires no additional power from the power supply:

Model: Custom

M/B: Dell Inc. 0VD5HY Version A07

BIOS: Dell Inc. Version A05. Dated: 09/18/2014

CPU: Intel® Xeon® CPU E3-1225 v3 @ 3.20GHz

HVM: Enabled

IOMMU: Enabled

Cache: 256 KiB, 1024 KiB, 8192 KiB

Memory: 12 GiB DDR3 Single-bit ECC (max. installable capacity 32 GiB)

 

What I did so far:

• For the VMs I use Machine type Q35-4.2 that already helped a lot in comparison to the i440fx
• Without vBios it didn´t work completely. So I use the distinct one from Techpowerup
• Changed the IOMMU groups so that the GPU has its own one. Tried the scenario with a shared group (GPU + audio device) too
• I used the RX460 as second graphic card with VNC as primary one as well as the RX460 as primary and remotely connected via Teamviewer. But same result...
• Server crashes also when the separate AMD driver from their homepage is used as well as the one Windows installs automatically
• I tried multiple combinations of CPU cores and RAM assigned to the VM too. Nothing helped so far.

 

Furthermore, I recognized that when the VM starts and I get a video output via GPU the fans stop immediately.

Don´t know if that is a typical behaviour therefore I logged the GPU data with GPU Z in the VM.  But nothing special too...

For more insights in the system and setup I use I have attached the diagnostics as well as the logged GPU data.

 

As I am quite inexperienced in terms of Unraid, I hope I just overlooked a minor thing that you can immediately identify 🙃

 

- Max

 

 

 

 

tower-diagnostics-20200516-1437.zip RX460_2020-05-16.ods

Edited May 27, 2020 by Umise
(SOLVED)

[Umise]

Hi together,

 

my current setup seems to be working now!

Tested already if it is stable under load with some benchmark tools and everything seems to be fine.

 

What I did so far:

I was able to get my hands on a second GPU.

So I dumped the original bios of my RX460, implemented it in the VM and ... everything is running smooth

 

Sometimes it can be that easy

 

- Max

[EArroyo]

I've always had issues with RX460 (ended up running an old driver and now with 20H2 it's not working but I don't get black screen, I just get disabled video adapter due to problems), can you explain exactly what you did to get it working?

 

Thanks.