unify desktop and laptop configs

etcnixos/common.nix

@@ -20,9 +20,32 @@
     inputs.lanzaboote.nixosModules.lanzaboote
   ];
 
+  nixpkgs.config.allowUnfree = true;
+
+  # allow overclocking (I actually underclock but lol)
+  hardware.amdgpu.overdrive.ppfeaturemask = "0xFFF7FFFF";
+
   hardware.enableRedistributableFirmware = true;
   hardware.cpu.amd.updateMicrocode = true;
 
+  services.greetd = {
+    enable = true;
+    settings = {
+      default_session = {
+        command = "${lib.getExe pkgs.greetd.tuigreet} --time --cmd niri-session";
+        user = username;
+      };
+    };
+  };
+
+  system.activationScripts = {
+    # FIX: https://github.com/NixOS/nix/issues/2982
+    "profile-channel-dummy".text = ''
+      #!/bin/sh
+      mkdir -p /nix/var/nix/profiles/per-user/root/channels
+    '';
+  };
+
   swapDevices = [ ];
 
   nix = {