nixos/modules/drivers/nvidia.nix

{ config, ... }:
{
  services.xserver.videoDrivers = [ "nvidia" ];

  hardware.graphics.enable = true;
  hardware.nvidia = {
    modesetting.enable = true;
    open = true;
    nvidiaSettings = true;
    package = config.boot.kernelPackages.nvidiaPackages.latest;
  };

  # 备用方案（当前禁用）：
  # 如果后续要启用 AMD 核显 + NVIDIA 独显切换，请取消下面整段注释。
  #
  # 重要提醒：
  # 1) 先确认两张显卡的 PCIe Bus ID，再启用；否则图形界面可能无法启动。
  # 2) 获取命令：lspci | grep -E "VGA|3D"
  # 3) 示例输出常见为 "01:00.0"、"06:00.0"（16 进制）。
  # 4) Nix 配置常用写法：PCI:<bus-dec>:<device-dec>:<function>
  #    例如 01:00.0 -> PCI:1:0:0；06:00.0 -> PCI:6:0:0
  #
  # let
  #   amdgpuBusId = "PCI:6:0:0";
  #   nvidiaBusId = "PCI:1:0:0";
  # in {
  #   services.xserver.videoDrivers = [ "amdgpu" "nvidia" ];
  #   hardware.nvidia.prime = {
  #     offload.enable = true;
  #     offload.enableOffloadCmd = true;
  #     amdgpuBusId = amdgpuBusId;
  #     nvidiaBusId = nvidiaBusId;
  #   };
  #   specialisation.nvidia-sync.configuration = {
  #     hardware.nvidia.prime = {
  #       offload.enable = lib.mkForce false;
  #       sync.enable = true;
  #       amdgpuBusId = amdgpuBusId;
  #       nvidiaBusId = nvidiaBusId;
  #     };
  #   };
  # }
}