diff -ur kdebase-workspace-4.0.72/libs/kworkspace/kdisplaymanager.cpp kdebase-workspace-4.0.72-ck-shutdown/libs/kworkspace/kdisplaymanager.cpp
--- kdebase-workspace-4.0.72/libs/kworkspace/kdisplaymanager.cpp	2008-02-21 10:28:02.000000000 +0100
+++ kdebase-workspace-4.0.72-ck-shutdown/libs/kworkspace/kdisplaymanager.cpp	2008-05-07 00:56:17.000000000 +0200
@@ -26,6 +26,7 @@
 #include <QtDBus/QtDBus>
 
 #include <QRegExp>
+#include <QLatin1String>
 
 #include <X11/Xauth.h>
 #include <X11/Xlib.h>
@@ -85,6 +86,7 @@
 				strcpy( sa.sun_path, "/tmp/.gdm_socket" );
 				if (::connect( d->fd, (struct sockaddr *)&sa, sizeof(sa) )) {
 					::close( d->fd );
+					DMType = NoDM;
 					d->fd = -1;
 					break;
 				}
@@ -185,6 +187,21 @@
 bool
 KDisplayManager::canShutdown()
 {
+	if (DMType == NoDM) {
+		// No DM or newest GDM running, we'll try shutting down through ConsoleKit.
+		// Unfortunately, ConsoleKit won't tell us if we're allowed to do that
+		// (it also depends on whether there are other users logged in on the
+		// system), so we can only check if it's running at all.
+		QDBusConnection systemBus = QDBusConnection::systemBus();
+		if (!systemBus.isConnected())
+			return false;
+		QDBusInterface consoleKit( QLatin1String( "org.freedesktop.ConsoleKit" ),
+		                           QLatin1String( "/org/freedesktop/ConsoleKit/Manager" ),
+		                           QLatin1String( "org.freedesktop.ConsoleKit.Manager" ),
+		                           systemBus );
+		return consoleKit.isValid();
+	}
+
 	if (DMType == OldKDM)
 		return strstr( ctl, ",maysd" ) != 0;
 
@@ -204,6 +221,21 @@
 	if (shutdownType == KWorkSpace::ShutdownTypeNone)
 		return;
 
+	if (DMType == NoDM) {
+		// No DM or newest GDM running, try shutting down through ConsoleKit.
+		QDBusConnection systemBus = QDBusConnection::systemBus();
+		if (!systemBus.isConnected())
+			return;
+		QDBusInterface consoleKit( QLatin1String( "org.freedesktop.ConsoleKit" ),
+		                           QLatin1String( "/org/freedesktop/ConsoleKit/Manager" ),
+		                           QLatin1String( "org.freedesktop.ConsoleKit.Manager" ),
+		                           systemBus );
+		if (consoleKit.isValid())
+			consoleKit.call( QLatin1String( shutdownType == KWorkSpace::ShutdownTypeReboot ?
+		                                        "Restart" : "Stop" ) );
+		return;
+	}
+
 	bool cap_ask;
 	if (DMType == NewKDM) {
 		QByteArray re;