PRIME: No offloading required. PRIME: is it supported?


I’ve installed Nvidia 450 on new installation of Kubuntu 20.04.1.

Prime Render Offload works in manual mode with __NV_PRIME_RENDER_OFFLOAD=1 __GLX_VENDOR_LIBRARY_NAME=nvidia

But nvidia-settings says prime is not supported.
And so I have no prime entry in the nvidia window.

So I think the swith between integrated and nvidia GPU will not be automatic and the “on demand” does not work.

What is wrong ? Thank you for your help.

Computer :
Asus A17-TUF766IU-H7074T

OS Details :
Kubuntu 20.04.1 with mainline 5.8.8 kernel
Nvidia Driver version : 450.66
Desktop Environment : Plasma
Window Manager : KDE

Hardware Details
Processor : AMD Ryzen 4800H
GPU : GeForce GTX 1660 Ti 6 Go

meloli@Asus-A17:~$ __NV_PRIME_RENDER_OFFLOAD=1 __GLX_VENDOR_LIBRARY_NAME=nvidia glxinfo | egrep “(OpenGL vendor|OpenGL renderer|OpenGL version)”
OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: GeForce GTX 1660 Ti/PCIe/SSE2
OpenGL version string: 4.6.0 NVIDIA 450.66

meloli@Asus-A17:~$ glxinfo | egrep “(OpenGL vendor|OpenGL renderer|OpenGL version)”
OpenGL vendor string: X.Org
OpenGL renderer string: AMD RENOIR (DRM 3.38.0, 5.8.8-050808-generic, LLVM 10.0.0)
OpenGL version string: 4.6 (Compatibility Profile) Mesa 20.0.8

meloli@Asus-A17:~$ nvidia-settings

(nvidia-settings:6099): GLib-GObject-CRITICAL **: 14:05:53.205: g_object_unref: assertion ‘G_IS_OBJECT (object)’ failed

ERROR: nvidia-settings could not find the registry key file. This file should have been installed along with this driver at /usr/share/nvidia/nvidia-application-profiles-key-documentation. The
application profiles will continue to work, but values cannot be prepopulated or validated, and will not be listed in the help text. Please see the README for possible values and

** Message: 14:05:53.270: PRIME: No offloading required. Abort
** Message: 14:05:53.271: PRIME: is it supported? no

nvidia-bug-report.log.gz (224.8 KB)

Sounds like render offload is working correctly. Currently, render offload is not enabled automatically – you have to launch specific applications on the dGPU using the environment variables.

The messages from nvidia-settings and the prime menu page are patches that Ubuntu adds to the upstream nvidia-settings source. I’m not very familiar with them so I suggest contacting Ubuntu for support for that.

Thank you for your answer. I’ve seen this entry here on a 435 kernel, so I don’t know if they exists today.

It was not said that it was only for Ubuntu but I will ask Ubuntu users.