diff --git a/flake.nix b/flake.nix
index b097bacd..b3de377a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -119,6 +119,7 @@
                 kernel.patches = [ "cjktty" ];
                 impermanence.enable = true;
                 networking.hostname = "pc";
+                sysctl.laptop-mode = 5;
               };
               hardware =
               {
diff --git a/modules/system/default.nix b/modules/system/default.nix
index 64f49a4f..c7c70d4a 100644
--- a/modules/system/default.nix
+++ b/modules/system/default.nix
@@ -15,6 +15,7 @@ inputs:
     ./security.nix
     ./sops.nix
     ./user.nix
+    ./sysctl.nix
   ];
   config =
   {
@@ -22,13 +23,6 @@ inputs:
     time.timeZone = "Asia/Shanghai";
     boot =
     {
-      kernel.sysctl =
-      {
-        "vm.oom_kill_allocating_task" = true;
-        "vm.oom_dump_tasks" = false;
-        "vm.overcommit_memory" = 1;
-        "kernel.sysrq" = 438;
-      };
       supportedFilesystems = [ "ntfs" ];
       consoleLogLevel = 7;
     };
diff --git a/modules/system/sysctl.nix b/modules/system/sysctl.nix
new file mode 100644
index 00000000..9f04f5f8
--- /dev/null
+++ b/modules/system/sysctl.nix
@@ -0,0 +1,24 @@
+inputs:
+{
+  options.nixos.system.sysctl = let inherit (inputs.lib) mkOption types; in
+  {
+    laptop-mode = mkOption { type = types.nullOr types.int; default = null; };
+  };
+  config =
+    let
+      inherit (inputs.lib) mkIf mkMerge;
+      inherit (inputs.config.nixos.system) sysctl;
+    in mkMerge
+    [
+      {
+        boot.kernel.sysctl =
+        {
+          "vm.oom_kill_allocating_task" = true;
+          "vm.oom_dump_tasks" = false;
+          "vm.overcommit_memory" = 1;
+          "kernel.sysrq" = 438;
+        };
+      }
+      (mkIf (sysctl.laptop-mode != null) { boot.kernel.sysctl."vm.laptop_mode" = sysctl.laptop-mode; })
+    ];
+}