"Failed to initialize OIDN CUDA device. Falling back to CPU" | V-Ray Standalone on Linux

V-Ray V-Ray for 3ds Max Issues
1

Hi there,

We are trying to evaluate how V-Ray Standalone performs on Linux. We’ve installed recommended drivers but we are seeing this warning in the logs:

“Failed to initialize OIDN CUDA device. Falling back to CPU”

System:
- NVIDIA-SMI 525.147.05 Driver Version: 525.147.05 CUDA Version: 12.0
- RTX 4090
- AMD EPYC 7543
- Ubuntu 22.04.5 LTS

How we can resolve this issue?

Best wishes,
Petr

2

Also if we downgrade GPU drivers to recommended version for CUDA rendering engine then we encounter this error/crash when trying to use RTX rendering engine on Linux:
OptiX requires NVidia driver 535.00 or later! Error Code : 7801. For more information visit: https://support.chaos.com/hc/en-us/a…-for-V-Ray-GPU (which is Windows only link btw)

Not exactly sure, what is going on there. Can we use most recent Nvidia drivers on Linux to switch between RTX and CUDA?​

3

That driver seems pretty old (October 2023), while the newest I found for that card is 570.133.07 (from March 2025). Could you try it?

4

@hermit.crab We got the warning from V-Ray Standalone when using newer GPU driver:

  • warning: Checking CUDA driver version: 5001: Installed driver version (535.183.6) is newer than the latest verified one (525.105)!

What does it mean if we will be using NOT verified driver?

5

You can ignore it. It seems it hasn’t been updated (in Linux) for quite a while, hence the confusion. I’ll mention it to the devs.