CUDA support disappears when plugging in external GPU #52191

New Issue

Chris · 2017-07-25T17:45:10+02:00

Chris commented

2017-07-25 17:45:10 +02:00

Hardware: Dell XPS 15, Win10, internal GPU GTX1050, external GPU GTX1080Ti (in Akitio Node via Thunderbolt 3)
Blender: 2.78c (also 2.80)
Latest versions of Thunderbolt drivers, akitio firmware, nvidia drivers

Just using the notebook without the external GPU: everything works fine.
Also the eGPU works correctly (nvidia control panel shows both GPUs, monitor on eGPU works, games and benchmarks work, ...)

But when the eGPU is connected to the PC, there are no more GPU options in the user preferecens "cycles compute device" (it only shows "None" ... not even the internal GTX1050 that always works when no 2nd GPU is connected)

I just bought the Akitio Node + GTX 1080 Ti in hopes to speed up rendering times and the setup works as one can only dream of EXCEPT for what I actually wanted to use it for: blender cycles :(

Hardware: Dell XPS 15, Win10, internal GPU GTX1050, external GPU GTX1080Ti (in Akitio Node via Thunderbolt 3) Blender: 2.78c (also 2.80) Latest versions of Thunderbolt drivers, akitio firmware, nvidia drivers Just using the notebook without the external GPU: everything works fine. Also the eGPU works correctly (nvidia control panel shows both GPUs, monitor on eGPU works, games and benchmarks work, ...) But when the eGPU is connected to the PC, there are no more GPU options in the user preferecens "cycles compute device" (it only shows "None" ... not even the internal GTX1050 that always works when no 2nd GPU is connected) I just bought the Akitio Node + GTX 1080 Ti in hopes to speed up rendering times and the setup works as one can only dream of EXCEPT for what I actually wanted to use it for: blender cycles :(

Chris commented

2017-07-25 17:45:10 +02:00

Changed status to: 'Open'

Chris commented

2017-07-25 17:45:10 +02:00

Added subscriber: @crazychris

Brecht Van Lommel commented

2017-07-25 18:01:37 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2017-07-25 18:01:37 +02:00

Two things to check:

Does CUDA work in another application like http://cuda-z.sourceforge.net/ ?
Run Blender from the command line with --debug-cycles and attach the output here.

Two things to check: * Does CUDA work in another application like http://cuda-z.sourceforge.net/ ? * Run Blender [from the command line ](https://docs.blender.org/manual/en/dev/render/workflows/command_line.html) with `--debug-cycles` and attach the output here.

Brecht Van Lommel commented

2017-07-25 18:02:15 +02:00

Also, did you install the drivers from nvidia.com? What is the exact driver version?

Chris commented

2017-07-25 18:57:23 +02:00

Yes, drivers are from nvidia. Control panel shows version 384.94
BUT Cuda-Z says "no compatible CUDA devices found" when the external gpu is plugged in :-(
... but nvidia gpu monitor shows eg Chrome running on the GPU (???)
any ideas?

Yes, drivers are from nvidia. Control panel shows version 384.94 BUT Cuda-Z says "no compatible CUDA devices found" when the external gpu is plugged in :-( ... but nvidia gpu monitor shows eg Chrome running on the GPU (???) any ideas?

Chris commented

2017-07-25 19:17:08 +02:00

After playing around with this setup now for a day I just found this link
https://egpu.io/forums/implementation-guides/dell-precision-7510-akitio-node-galax-gtx-1080-hof-its-working/
where the user disabled the internal nvidia GPU and then the external GPU worked in CUDA-Z (!)
... and now it works in blender too!
(not a perfect solution but at least I didnt buy the Akitio +1080Ti for nothing - and maybe nvidia can fix this in the future)
PS: THX brecht for your help!

After playing around with this setup now for a day I just found this link https://egpu.io/forums/implementation-guides/dell-precision-7510-akitio-node-galax-gtx-1080-hof-its-working/ where the user disabled the internal nvidia GPU and then the external GPU worked in CUDA-Z (!) ... and now it works in blender too! (not a perfect solution but at least I didnt buy the Akitio +1080Ti for nothing - and maybe nvidia can fix this in the future) PS: THX brecht for your help!

Brecht Van Lommel commented

2017-07-25 19:29:54 +02:00

Changed status from 'Open' to: 'Resolved'

Brecht Van Lommel closed this issue

2017-07-25 19:29:54 +02:00

Brecht Van Lommel self-assigned this 2017-07-25 19:29:54 +02:00

Brecht Van Lommel commented

2017-07-25 19:29:54 +02:00

Ok, good to hear you found a solution, sounds like there is not much we can do about this in Blender.

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CUDA support disappears when plugging in external GPU #52191