How to use Nvidia PRIME offload to run the X server on the integrated board

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Ok, I’ve added:

  boot.extraModprobeConfig = "options nvidia \"NVreg_DynamicPowerManagement=0x02\"\n";
  services.udev.extraRules = ''
  # Remove NVIDIA USB xHCI Host Controller devices, if present
  ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x0c0330", ATTR{remove}="1"
  
  # Remove NVIDIA USB Type-C UCSI devices, if present
  ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x0c8000", ATTR{remove}="1"
  
  # Remove NVIDIA Audio devices, if present
  ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x040300", ATTR{remove}="1"
  
  # Enable runtime PM for NVIDIA VGA/3D controller devices on driver bind
  ACTION=="bind", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x030000", TEST=="power/control", ATTR{power/control}="auto"
  ACTION=="bind", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x030200", TEST=="power/control", ATTR{power/control}="auto"
  
  # Disable runtime PM for NVIDIA VGA/3D controller devices on driver unbind
  ACTION=="unbind", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x030000", TEST=="power/control", ATTR{power/control}="on"
  ACTION=="unbind", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x030200", TEST=="power/control", ATTR{power/control}="on"
  '';

to my configuration.nix

That has changed /sys/bus/pci/devices/0000:01:00.0/power/control to auto, as expected. But when I cat /sys/bus/pci/devices/0000:01:00.0/power/runtime_status, I still get active.

I’m not sure whether that solution actually turns off the GPU, or if it just keeps it in a low-powered state. I’ll give it a test in the next few days.