Appendix K. GPU Names

Many X configuration options that take a display device name can also be qualified with a GPU. This is done by prepending one of the GPU's names to the display device name. For example, the "MetaModes" X configuration option can be used to enable display devices from multiple GPUs in SLI Mosaic or Base Mosaic configurations:

    Option "MetaModes" "1280x1024 +0+0, 1280x1024 +1280+0"

You can use a display device name qualifier along with a GPU qualifier to configure which display should be picked and from which GPU. E.g.,

    Option "MetaModes" "GPU-1.DFP-0:1280x1024 +0+0, GPU-0.DFP-0:1280x1024 +1280+0"

Other X configuration options that support GPU names include:

The description of each X configuration option in Appendix B, X Config Options provides more detail on the available syntax for each option.

To find all available names for your configuration, start the X server with verbose logging enabled (e.g., startx -- -logverbose 5, or enable the "ModeDebug" X configuration option with nvidia-xconfig --mode-debug and restart the X server).

The X log (normally /var/log/Xorg.0.log) will contain information regarding each GPU. E.g.,

(II) NVIDIA(0): NVIDIA GPU NVS 510 (GK107) at PCI:15:0:0 (GPU-0)
(II) NVIDIA(0): VERBOSE: GPU UUID: GPU-758a4cf7-0761-62c7-9bf7-c7d950b817c6

Alternatively, nvidia-xconfig can be used to query the GPU names: nvidia-xconfig --query-gpu-info

GPU #0:
  Name      : NVS 510
  UUID      : GPU-758a4cf7-0761-62c7-9bf7-c7d950b817c6
  PCI BusID : PCI:3:0:0

Each name has different properties that may affect which name is appropriate to use. The possible names are: