added a thinkpad fan controller module (because that isnt inbuilt???)

modules/system/drivers/thinkpadFanControl.nix

@@ -0,0 +1,27 @@
+{
+  self,
+  moduleWithSystem,
+  ...
+}: {
+  flake.nixosModules.thinkpadFanControl = moduleWithSystem ({inputs', ...}: {
+    # Enable fan control for the thinkpad module (why is this not the default??)
+    boot.extraModprobeConfig = ''
+      options thinkpad_acpi fan_control=1
+    '';
+
+    services.thinkfan = {
+      enable = true;
+
+      extraArgs = ["-s" "5"];
+
+      levels = [
+        [0 0 55]
+        [1 50 60]
+        [3 58 68]
+        [5 65 75]
+        [7 73 85]
+        ["level disengaged" 82 32767]
+      ];
+    };
+  });
+}