Fix: enhance NVIDIA configuration for improved performance and compatibility on desktop and laptop

NVIDIA-SETUP.md

@@ -0,0 +1,58 @@
+# 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**:
+   ```bash
+   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`:
+   ```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:
+   ```bash
+   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 `:`
+
+---
+
+## 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`:
+  ```bash
+  nvidia-offload <program>
+  ```