diff --git a/modules/services/x11/display-managers/default.nix b/modules/services/x11/display-managers/default.nix
index cdfd271ee65..528b3a6f727 100644
--- a/modules/services/x11/display-managers/default.nix
+++ b/modules/services/x11/display-managers/default.nix
@@ -53,12 +53,6 @@ let
         fi
       ''}
 
-      # Start a ConsoleKit session so that we get ownership of various
-      # devices.
-      if test -z "$XDG_SESSION_COOKIE"; then
-          exec ${pkgs.consolekit}/bin/ck-launch-session "$0" "$sessionType"
-      fi
-
       # Handle being called by kdm.
       if test "''${1:0:1}" = /; then eval exec "$1"; fi
 
diff --git a/modules/services/x11/display-managers/kdm.nix b/modules/services/x11/display-managers/kdm.nix
index fe7802100b2..47d9299fb79 100644
--- a/modules/services/x11/display-managers/kdm.nix
+++ b/modules/services/x11/display-managers/kdm.nix
@@ -111,7 +111,7 @@ in
         logsXsession = true;
       };
 
-    security.pam.services = [ { name = "kde"; allowNullPassword = true; } ];
+    security.pam.services = [ { name = "kde"; allowNullPassword = true; ownDevices = true; } ];
 
     users.extraUsers = singleton
       { name = "kdm";
diff --git a/modules/services/x11/display-managers/slim.nix b/modules/services/x11/display-managers/slim.nix
index 97c5f1d1b2b..fc4df80d810 100644
--- a/modules/services/x11/display-managers/slim.nix
+++ b/modules/services/x11/display-managers/slim.nix
@@ -115,7 +115,7 @@ in
 
     # Allow null passwords so that the user can login as root on the
     # installation CD.
-    security.pam.services = [ { name = "slim"; allowNullPassword = true; } ];
+    security.pam.services = [ { name = "slim"; allowNullPassword = true; ownDevices = true; } ];
 
   };