--- /etc/X11/xdm/Xstartup	2009-06-03 12:40:26.000000000 +0700
+++ Xstartup	2009-11-19 15:36:59.557499617 +0700
@@ -1,4 +1,7 @@
 #!/bin/sh
 # Register a login (derived from GiveConsole as follows:)
 #
+
+kill -9 $(cat /var/run/Xsession.pid)
+
 /usr/bin/sessreg  -a -w "/var/log/wtmp" -u "/var/run/utmp" 	-x "XDMCONFIGDIR/Xservers" -l $DISPLAY -h "" $USER