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Add Discrete GPU Detection

Jan requested to merge Jan200101/switcheroo-control:PR/discrete-detection into master

supersedes !68 (closed) since it has become messy and unclear.

This Merge Request adds a boolean Discrete key which signifies if the GPU in question is considered Discrete or not by querying the driver and heuristics.

Detection is done in the following ways through udev:

  • amdgpu
  • nouveau
    • device info is queried
    • if the device platform is IGP or SOC its not discrete
    • otherwise its considered discrete
      • while this could be considered wrong, there are few available integrated Nvidia GPUs and to my knowledge no Multi GPU systems with an integrated Nvidia GPU
  • nvidia
    • always considered discrete
      • I found no good way to query the proprietary nvidia drivers without having to poke at it with proprietary libraries.
      • the same reason as for why the nouveau detection consideres anything else discrete also applies
  • i915
    • the PCI ID of integrated Intel GPUs appears to always be `0000:00:02.0`
      • I've asked around the community for sample data and out of 17 sets of data it applied every time

I've personally tested this against the following setups:

  • Intel integrated GPU
  • Nvidia discrete GPU (both using Nouveau and Nvidia drivers)
  • AMD discrete GPU
  • AMD integrated GPU

and this far had no issues.

CI failure appears to be unrelated to any code issues

it compiles fine locally and on copr

Edited by Jan

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