try out plasma 6 (broken), add tlp

configuration.nix

@@ -54,8 +54,10 @@
     desktopManager = {
       xterm.enable = false;
       gnome.enable = true;
+      # plasma6.enable = true;
     };
     displayManager.gdm.enable = true;
+    # displayManager.defaultSession = "plasmax11";
   };
   # console.useXkbConfig = true;
   console.keyMap = ./galvatron/keys.map;
@@ -130,6 +132,7 @@
       zsh
       gparted
       ntfs3g
+      tlp
     ];
   };