My computer has one integrated graphics card and 2 Nvidia RTX 3070 GPUS. I am using Ubuntu 20.04 and nvidia-driver-530.
lspci | grep VGA 00:02.0 VGA compatible controller: Intel Corporation AlderLake-S GT1 (rev 0c) 01:00.0 VGA compatible controller: NVIDIA Corporation GA104 [GeForce RTX 3070 Lite Hash Rate] (rev a1) 05:00.0 VGA compatible controller: NVIDIA Corporation GA104 [GeForce RTX 3070 Lite Hash Rate] (rev a1) I am currently trying to test my 3070 graphics cards with the Phoronix Test Suite.
I am using nvidia-prime and prime-select: on-demand to run the terminal on the intel iGPU and phoronix tests on the Nvidia 3070: prime-run phoronix-test-suite run unigine-heaven.
There were some issues getting nvidia-prime to work, so I followed the suggestions from this article: https://askubuntu.com/questions/1364762/prime-run-command-not-found
cat /usr/bin/prime-run #!/bin/bash export __NV_PRIME_RENDER_OFFLOAD=1 export __GLX_VENDOR_LIBRARY_NAME=nvidia export __VK_LAYER_NV_optimus=NVIDIA_only export VK_ICD_FILENAMES=/usr/share/vulkan/icd.d/nvidia_icd.json exec "$@" By using prime-run I am successfully able to run the phoronix test suite on GPU 0 which has bus id 01:00.0 / PCI:1:0:0.
However, I seem unable to run any tests with GPU 1 which has bus id 05:00.0 / PCI:5:0:0.
Modifying /etc/X11/xorg.conf by changing the bus number and rebooting as suggested by the following links didn't seem to do anything and still ran on GPU 0.
- https://stackoverflow.com/questions/18382271/how-can-i-modify-xorg-conf-file-to-force-x-server-to-run-on-a-specific-gpu-i-a
- https://askubuntu.com/questions/787030/setting-the-default-gpu
cat /etc/X11/xorg.conf # nvidia-xconfig: X configuration file generated by nvidia-xconfig # nvidia-xconfig: version 530.41.03 Section "ServerLayout" Identifier "Layout0" Screen 0 "Screen0" InputDevice "Keyboard0" "CoreKeyboard" InputDevice "Mouse0" "CorePointer" EndSection Section "Files" EndSection Section "InputDevice" # generated from default Identifier "Mouse0" Driver "mouse" Option "Protocol" "auto" Option "Device" "/dev/psaux" Option "Emulate3Buttons" "no" Option "ZAxisMapping" "4 5" EndSection Section "InputDevice" # generated from default Identifier "Keyboard0" Driver "kbd" EndSection Section "Monitor" Identifier "Monitor0" VendorName "Unknown" ModelName "Unknown" Option "DPMS" EndSection Section "Device" Identifier "Device0" Driver "nvidia" VendorName "NVIDIA Corporation" # BusID "PCI:1:0:0" BusID "PCI:5:0:0" EndSection Section "Screen" Identifier "Screen0" Device "Device0" Monitor "Monitor0" DefaultDepth 24 SubSection "Display" Depth 24 EndSubSection EndSection In fact, I deleted etc/X11/xorg.conf and was able to run the phoronix tests on GPU 0 without the conf file at all. I would guess that one of the drivers or programs I run automatically selects the nvidia card with the lowest bus id.
I would like to know where I should look to change the settings or any configuration files in order to select the second RTX 3070 gpu with the bus id 05:00.0. I would be more than happy to provide any further information.
