Nvidia prime configuration and result

configuration.nix

{ pkgs, ... }:
{
  hardware.opengl.driSupport32Bit = true;
  hardware.opengl.enable = true;
  hardware.opengl.extraPackages32 = [ pkgs.pkgsi686Linux.libva ];
  hardware.nvidia.prime = {
    offload.enable = true;
    nvidiaBusId = "PCI:1:0:0";
    intelBusId = "PCI:0:2:0";
  };
  hardware.nvidia.modesetting.enable = true;
  hardware.nvidia.nvidiaPersistenced = true;

  services.xserver.videoDrivers = [ "nvidia" "modesetting" ];
  services.xserver.dpi = 96;
}

nvidia-offload

#!/nix/store/6737cq9nvp4k5r70qcgf61004r0l2g3v-bash-4.4-p23/bin/bash
export __NV_PRIME_RENDER_OFFLOAD=1
export __NV_PRIME_RENDER_OFFLOAD_PROVIDER=NVIDIA-G0
export __GLX_VENDOR_LIBRARY_NAME=nvidia
export __VK_LAYER_NV_optimus=NVIDIA_only
exec -a "$0" "$@"

nvidia-offload output

name of display: :0
X Error of failed request:  BadValue (integer parameter out of range for operation)
  Major opcode of failed request:  152 (GLX)
  Minor opcode of failed request:  24 (X_GLXCreateNewContext)
  Value in failed request:  0x0
  Serial number of failed request:  39
  Current serial number in output stream:  40

nvidia-smi

+-----------------------------------------------------------------------------+
| NVIDIA-SMI 450.66       Driver Version: 450.66       CUDA Version: 11.0     |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|                               |                      |               MIG M. |
|===============================+======================+======================|
|   0  GeForce GTX 960M    On   | 00000000:01:00.0 Off |                  N/A |
| N/A   45C    P8    N/A /  N/A |      0MiB /  4046MiB |      0%      Default |
|                               |                      |                  N/A |
+-------------------------------+----------------------+----------------------+
                                                                               
+-----------------------------------------------------------------------------+
| Processes:                                                                  |
|  GPU   GI   CI        PID   Type   Process name                  GPU Memory |
|        ID   ID                                                   Usage      |
|=============================================================================|
|  No running processes found                                                 |
+-----------------------------------------------------------------------------+

xrandr --listproviders

Providers: number : 2
Provider 0: id: 0x44 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 3 outputs: 2 associated providers: 0 name:modesetting
Provider 1: id: 0xc7 cap: 0x0 crtcs: 0 outputs: 0 associated providers: 0 name:modesetting