initial commit

modules/system/hardware/cpu/amd.nix

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+{...}: {
+  # AMD CPU: microcode updates (applied via initrd at boot).
+  flake.nixosModules.cpuAmd = {...}: {
+    hardware.cpu.amd.updateMicrocode = true;
+    hardware.enableRedistributableFirmware = true;
+  };
+}

modules/system/hardware/cpu/intel.nix

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+{...}: {
+  # Intel CPU: microcode updates (applied via initrd at boot).
+  flake.nixosModules.cpuIntel = {...}: {
+    hardware.cpu.intel.updateMicrocode = true;
+    hardware.enableRedistributableFirmware = true;
+  };
+}

modules/system/hardware/gpu/amd.nix

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+{...}: {
+  # AMD GPU (mesa + RADV/ROCm).
+  flake.nixosModules.gpuAmd = {pkgs, ...}: {
+    environment.systemPackages = with pkgs; [
+      mesa
+      vulkan-tools
+      rocmPackages.rocm-smi
+      rocmPackages.rocminfo
+    ];
+    hardware.graphics = {
+      enable = true;
+      enable32Bit = true;
+      extraPackages = with pkgs; [
+        libva-vdpau-driver
+        libvdpau-va-gl
+        rocmPackages.clr.icd
+      ];
+    };
+  };
+}

modules/system/hardware/gpu/intel.nix

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+{...}: {
+  # Intel integrated GPU (mesa + VA-API hardware video acceleration).
+  flake.nixosModules.gpuIntel = {pkgs, ...}: {
+    environment.systemPackages = with pkgs; [
+      mesa
+      vulkan-tools
+    ];
+    hardware.graphics = {
+      enable = true;
+      enable32Bit = true;
+      extraPackages = with pkgs; [
+        intel-media-driver # modern iHD driver (Broadwell+)
+        intel-vaapi-driver # legacy i965 driver
+        libva-vdpau-driver
+      ];
+    };
+  };
+}

modules/system/hardware/gpu/nvidia-prime.nix

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+{self, ...}: {
+  # Hybrid Intel + NVIDIA (PRIME) for laptops like the T480 (Intel UHD 620 +
+  # NVIDIA MX150). Uses "offload" mode: the dGPU stays powered down by default
+  # (minimal extra battery drain) and is only used for apps launched with
+  # `nvidia-offload <cmd>`. It also pulls in the Intel GPU stack (gpuIntel).
+  #
+  # Bus IDs below are specific to the T480 (from `lspci`):
+  #   Intel  00:02.0 -> PCI:0:2:0
+  #   NVIDIA 01:00.0 -> PCI:1:0:0
+  # Adjust for other machines.
+  flake.nixosModules.gpuNvidiaPrime = {
+    config,
+    pkgs,
+    ...
+  }: {
+    imports = [self.nixosModules.gpuIntel];
+
+    services.xserver.videoDrivers = ["nvidia"];
+
+    hardware.nvidia = {
+      modesetting.enable = true;
+      # MX150 is Pascal (pre-Turing); the proprietary modules are the safe choice.
+      open = false;
+      nvidiaSettings = true;
+      powerManagement.enable = true;
+
+      prime = {
+        # Offload keeps the NVIDIA GPU asleep until explicitly used. This gives
+        # the `nvidia-offload` helper wrapper. Swap to sync mode if you want the
+        # dGPU always driving the display (higher power draw).
+        offload = {
+          enable = true;
+          enableOffloadCmd = true; # provides `nvidia-offload` wrapper
+        };
+
+        intelBusId = "PCI:0:2:0";
+        nvidiaBusId = "PCI:1:0:0";
+      };
+    };
+  };
+}

modules/system/hardware/gpu/nvidia.nix

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+{...}: {
+  # Dedicated NVIDIA GPU (single discrete card, no hybrid/PRIME).
+  # For Intel+NVIDIA laptops (e.g. the T480), use gpuNvidiaPrime instead.
+  flake.nixosModules.gpuNvidia = {
+    config,
+    pkgs,
+    ...
+  }: {
+    services.xserver.videoDrivers = ["nvidia"];
+
+    hardware.graphics = {
+      enable = true;
+      enable32Bit = true;
+    };
+
+    hardware.nvidia = {
+      modesetting.enable = true;
+      # Proprietary kernel modules. Set to true only for Turing+ (RTX 20xx and
+      # newer) where the open modules are well supported.
+      open = false;
+      nvidiaSettings = true;
+      # Fixes suspend/resume corruption on many setups.
+      powerManagement.enable = true;
+      package = config.boot.kernelPackages.nvidiaPackages.stable;
+    };
+
+    environment.systemPackages = with pkgs; [
+      vulkan-tools
+    ];
+  };
+}