Improve / fix screen lock and brightness buttons

systems/x86_64-linux/aspi/default.nix

@@ -118,6 +118,21 @@
   services.xserver.windowManager.i3.package = pkgs.i3-gaps;
 
   services.blueman.enable = true;
+  services.upower.enable = true;
+
+  # TODO: move into i3 module
+  programs.xss-lock = {
+    # responds to "loginctl lock-session" via dbus
+    enable = true;
+    lockerCommand = "${pkgs.i3lock}/bin/i3lock --ignore-empty-password --color=000000";
+  };
+  # services.xserver.xautolock = { # TODO: does not work
+  #   enable = true;
+  #   time = 1;
+  # };
+  programs.dconf.enable = true;
+  services.logind.lidSwitch = "lock";
+  services.logind.lidSwitchDocked = "lock";
 
   programs.kdeconnect.enable = true;
 
@@ -263,6 +278,8 @@
     frajul.pulseaudio-popup
     gparted-xhost # needs to be installed as system package so it can be actually opened
     xclip
+
+    brightnessctl
   ];
 
   virtualisation.docker.enable = true;