Add support for DisplayLink docks at work.

nix/configuration/roles/displaylink/default.nix

@@ -0,0 +1,40 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+{
+  imports = [ ];
+
+  options.me = {
+    displaylink.enable = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      example = true;
+      description = "Whether we want to install displaylink.";
+    };
+  };
+
+  config = lib.mkIf config.me.displaylink.enable (
+    lib.mkMerge [
+      {
+        environment.systemPackages = with pkgs; [
+          displaylink
+        ];
+
+        allowedUnfree = [ "displaylink" ];
+
+        boot = {
+          extraModulePackages = [ config.boot.kernelPackages.evdi ];
+          initrd.kernelModules = [
+            "evdi"
+          ];
+        };
+      }
+      (lib.mkIf config.me.graphical {
+      })
+    ]
+  );
+}