nix-flake/NVIDIA-SETUP.md

NVIDIA Setup Notes

Laptop Bus ID Configuration Required

File to edit: /home/zeph/nix-flake/system/nvidia-laptop.nix

Steps:

1. Run this command on your laptop:

   sudo lshw -c display
   

2. Look for the bus info lines in the output:

   • Intel GPU: bus info: pci@0000:00:02.0
   • NVIDIA GPU: bus info: pci@0000:01:00.0

3. Convert the PCI addresses to NixOS format:

   • pci@0000:00:02.0 → PCI:0:2:0 (Intel)
   • pci@0000:01:00.0 → PCI:1:0:0 (NVIDIA)

4. Update the values in nvidia-laptop.nix:

   intelBusId = "PCI:0:2:0";    # Replace with your Intel bus ID
   nvidiaBusId = "PCI:1:0:0";   # Replace with your NVIDIA bus ID
   

5. Rebuild after updating:

   sudo nixos-rebuild switch --flake /home/zeph/nix-flake#laptop
   

Format Conversion Example:

pci@0000:XX:YY.Z  →  PCI:XX:YY:Z

Remove the 0000: prefix and convert the . to :

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Testing NVIDIA Setup

Desktop (RTX 3080):

• nvidia-smi - Check if driver is loaded
• nvtop - Monitor GPU usage
• glxinfo | grep NVIDIA - Verify OpenGL

Laptop (GTX 1050):

• nvidia-smi - Check if driver is loaded
• nvidia-offload glxgears - Test offload mode
• nvtop - Monitor both Intel and NVIDIA GPUs

Using NVIDIA on Laptop:

• Normal apps use Intel iGPU (better battery)
• Prefix GPU-intensive apps with nvidia-offload:

  nvidia-offload <program>