stargate powersavings

systems/x86_64-linux/stargate/powersave.nix

@@ -0,0 +1,24 @@
+{
+  lib,
+  pkgs,
+  config,
+  ...
+}: {
+  powerManagement.powertop.enable = true;
+  environment.systemPackages = with pkgs; [
+    powertop
+  ];
+  services.udev.extraRules = let
+    mkRule = as: lib.concatStringsSep ", " as;
+    mkRules = rs: lib.concatStringsSep "\n" rs;
+  in
+    mkRules [
+      (mkRule [
+        ''ACTION=="add|change"''
+        ''SUBSYSTEM=="block"''
+        ''KERNEL=="sd[a-z]"''
+        ''ATTR{queue/rotational}=="1"''
+        ''RUN+="${pkgs.hdparm}/bin/hdparm -B 90 -S ${builtins.toString (30 * 60 / 5)} /dev/%k"''
+      ])
+    ];
+}