aa

configuration.nix

@@ -130,6 +130,7 @@
   # List packages installed in system profile. To search, run:
   # $ nix search wget
   environment.systemPackages = with pkgs; [
+    set-backlight-script
     neovim
     git
     wget
@@ -335,4 +336,29 @@ $NEW_PROMPT_COMMAND"
     
   };
 
+
+  let set-backlight-script = (writeShellApplication {
+      name = "set-backlight-script";
+      text = ''
+        #!/bin/sh
+        
+        for d in /sys/class/backlight/*; do
+        	cd $d
+        	echo $(( $(cat max_brightness) / 2)) > brightness
+        done
+      '';
+  });
+  in
+  systemd.services.99setbacklight = {
+    enable = true;
+    description = "bar";
+    unitConfig = {
+      Type = "simple";
+    };
+    serviceConfig = {
+      ExecStart = "${set-backlight-script}";
+    };
+    wantedBy = [ "multi-user.target" ];
+  };
+
 }

startup.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+for dev in /sys/class/backlight/* ; do
+	cd $dev
+	echo $(( $(cat max_brightness) / 2)) > brightness
+done