diff -u lightdm-1.0.6/debian/changelog lightdm-1.0.6/debian/changelog
--- lightdm-1.0.6/debian/changelog
+++ lightdm-1.0.6/debian/changelog
@@ -1,3 +1,10 @@
+lightdm (1.0.6-0ubuntu1.7) oneiric-proposed; urgency=low
+
+  * Wait for the VT to become active when switching to avoid a suspected race
+    condition somewhere between LightDM, X, ConsoleKit and the kernel. (LP: #851612)
+
+ -- Shih-Yuan Lee (FourDollars) <sylee@ubuntu.com>  Fri, 16 Mar 2012 17:16:27 +0800
+
 lightdm (1.0.6-0ubuntu1.6) oneiric-security; urgency=low
 
   * SECURITY UPDATE: Guest session arbitrary file deletion (LP: #953044)
diff -u lightdm-1.0.6/debian/patches/series lightdm-1.0.6/debian/patches/series
--- lightdm-1.0.6/debian/patches/series
+++ lightdm-1.0.6/debian/patches/series
@@ -11,0 +12 @@
+13_wait-for-the-vt.patch
only in patch2:
unchanged:
--- lightdm-1.0.6.orig/debian/patches/13_wait-for-the-vt.patch
+++ lightdm-1.0.6/debian/patches/13_wait-for-the-vt.patch
@@ -0,0 +1,21 @@
+Description: Wait for the VT to become active when switching to avoid a suspected race condition somewhere between LightDM, X, ConsoleKit and the kernel
+Author: Robert Ancell <robert.ancell@canonical.com>
+Origin: upstream, http://bazaar.launchpad.net/~lightdm-team/lightdm/trunk/revision/1375
+Bug: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/851612
+
+Index: lightdm-1.0.6/src/vt.c
+===================================================================
+--- lightdm-1.0.6.orig/src/vt.c	2012-03-16 17:08:36.709912105 +0800
++++ lightdm-1.0.6/src/vt.c	2012-03-16 17:14:59.659811048 +0800
+@@ -82,6 +82,11 @@
+         int n = number;
+         if (ioctl (console_fd, VT_ACTIVATE, n) < 0)
+             g_warning ("Error using VT_ACTIVATE %d on /dev/console: %s", n, strerror (errno));
++	/* Wait for the VT to become active to avoid a suspected
++	 * race condition somewhere between LightDM, X, ConsoleKit and the kernel.
++	 * See https://bugs.launchpad.net/bugs/851612 */
++	if (ioctl (console_fd, VT_WAITACTIVE) < 0)
++	    g_warning ("Error using VT_WAITACTIVE %d on /dev/console: %s", n, strerror (errno));
+         close (console_fd);
+     }
+ #endif