reorganize hardware

modules/hardware/graphics/i915.nix

@@ -0,0 +1,24 @@
+{ pkgs, config, lib, inputs, ... }:
+
+with lib;
+let
+  cfg = config.modules.hardware.graphics.i915;
+in {
+  options.modules.hardware.graphics.i915 = {
+    enable = mkEnableOption "Enable Intel i915 graphics drivers, used in conjuction with nixos-hardware";
+    powersave = mkEnableOption {
+      default = config.modules.core.laptop;
+      description = "Enable intel i915-specific powersaving tweaks";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = with pkgs; [ intel-gpu-tools ];
+    hardware.intel-gpu-tools.enable = true;
+
+    boot.kernelParams = [
+      # enable gpu virtualization
+      "i915.enable_gvt=1"
+    ] ++ optional cfg.powersave "i915.enable_fbc=1";
+  };
+}