AMD and NVIDIA GPUs together on Ubuntu 20.04

Question

I recently got AMD Radeon RX 5700 XT card and I already had a GeForce RTX 2070 as my main GPU for sometime now. I was trying to run them together and managed to do that on manjaro after installing the AMD card as the main one and running applications on the NVIDA card with prime-run when needed, now I'm trying to move back to Ubuntu and I can't get the same configuration running.

1. prime-run doesn't work at all even after installing nvidia-prime
2. Running anything with env vars __NV_PRIME_RENDER_OFFLOAD=2 __GLX_VENDOR_LIBRARY_NAME=nvidia doesn't work

root@my-pc:~#__NV_PRIME_RENDER_OFFLOAD=2 __GLX_VENDOR_LIBRARY_NAME=nvidia glxinfo | grep OpenGL
X Error of failed request:  BadValue (integer parameter out of range for operation)
  Major opcode of failed request:  152 (GLX)
  Minor opcode of failed request:  24 (X_GLXCreateNewContext)
  Value in failed request:  0x0
  Serial number of failed request:  39
  Current serial number in output stream:  40

I installed the proprietary drivers for both cards tried the answer here and nothing seem to work.

Solution 1

It was fixed by removing nvidia drivers and reinstalling them.

Solution 2

It's not really the answer, but if it helps.

I have both AMD and Nvidia on a laptop I force Nvidia with instruction from https://forums.developer.nvidia.com/t/i-cant-enable-nvidia-gpu-with-nvidia-prime/69899/4

In this file /usr/share/X11/xorg.conf.d/10-nvidia.conf I put:

Option "PrimaryGPU" "true"

And reboot

Solution 3

Steps to install Ubuntu 20 with Nvidia + AMD

1. Install Ubuntu 20.04.2.0 LTS (Focal Fossa) server
2. Once started

   apt-get update && time apt-get dist-upgrade
   

3. Reboot and then install AMD drivers

   wget --referer https://www.amd.com/en/support/kb/release-notes/rn-amdgpu-unified-linux-20-45 https://drivers.amd.com/drivers/ linux / amdgpu-pro-20.45-1188099-ubuntu-20.04.tar.xz
   tar xJf amdgpu-pro-20.45-1188099-ubuntu-20.04.tar.xz </code>
   cd amdgpu-pro-20.45-1188099-ubuntu-20.04
   sudo ./amdgpu-pro-install --opencl=legacy,pal --headless --no-dkms 
   

4. Restart and install Nvidia drivers

   ubuntu-drivers autoinstall
   # Note: check with nvidia-smi
   # If it has not been installed correctly then execute:
   sudo apt install nvidia-driver-455
   

5. Reboot and install clinfo

   apt install clinfo
   

   run clinfo to check that both cards have been detected

Comments

[RedEyed]

what about xorg.conf, may I put that into device section?

[0xC0000022L]

For me the /usr/share/X11/xorg.conf.d/11-nvidia-prime.conf contains the PrimaryGPU setting already (search for prime-select). Also the xorg.conf in /etc/X11 should take precedence.