diff -aur lightdm-gtk-greeter-1.3.1.src/data/greeter.ui lightdm-gtk-greeter-1.3.1.patch/data/greeter.ui
--- lightdm-gtk-greeter-1.3.1.src/data/greeter.ui	2012-07-31 08:05:50.000000000 +1000
+++ lightdm-gtk-greeter-1.3.1.patch/data/greeter.ui	2012-09-01 14:43:51.034601664 +1000
@@ -224,6 +224,7 @@
         <property name="visible">True</property>
         <property name="can_focus">False</property>
         <property name="pack_direction">rtl</property>
+        <property name="height-request">40</property>
         <child>
           <object class="GtkMenuItem" id="power_menuitem">
             <property name="name">power_menuitem</property>
@@ -310,6 +311,15 @@
                     <signal name="toggled" handler="a11y_contrast_cb" swapped="no"/>
                   </object>
                 </child>
+                <child>
+                  <object class="GtkCheckMenuItem" id="keyboard_menuitem">
+                    <property name="visible">True</property>
+                    <property name="can_focus">False</property>
+                    <property name="use_action_appearance">False</property>
+                    <property name="label" translatable="yes">On Screen Keyboard</property>
+                    <signal name="toggled" handler="a11y_keyboard_cb" swapped="no"/>
+                  </object>
+                </child>
               </object>
             </child>
           </object>
diff -aur lightdm-gtk-greeter-1.3.1.src/data/lightdm-gtk-greeter.conf lightdm-gtk-greeter-1.3.1.patch/data/lightdm-gtk-greeter.conf
--- lightdm-gtk-greeter-1.3.1.src/data/lightdm-gtk-greeter.conf	2012-08-24 03:29:44.000000000 +1000
+++ lightdm-gtk-greeter-1.3.1.patch/data/lightdm-gtk-greeter.conf	2012-09-01 14:46:24.969861911 +1000
@@ -1,9 +1,11 @@
 #
+# [greeter]
 # logo = Logo file to use, either an image absolute path, or a path relative to the greeter data directory
 # background = Background file to use, either an image path or a color (e.g. #772953)
 # theme-name = GTK+ theme to use
 # icon-theme-name = Icon theme to use
 # font-name = Font to use
+# cursor-name = Cursor theme to use
 # xft-antialias = Whether to antialias Xft fonts (true or false)
 # xft-dpi = Resolution for Xft in dots per inch (e.g. 96)
 # xft-hintstyle = What degree of hinting to use (hintnone, hintslight, hintmedium, or hintfull)
@@ -16,8 +18,15 @@
 #theme-name=
 #icon-theme-name=
 #font-name=
+#cursor-name=
 #xft-antialias=
 #xft-dpi=
 #xft-hintstyle=
 #xft-rgba=
 #show-language-selector=
+#
+# [a11y]
+# keyboard = Command to launch on screen keyboard
+#
+[a11y]
+#keyboard=
diff -aur lightdm-gtk-greeter-1.3.1.src/src/lightdm-gtk-greeter.c lightdm-gtk-greeter-1.3.1.patch/src/lightdm-gtk-greeter.c
--- lightdm-gtk-greeter-1.3.1.src/src/lightdm-gtk-greeter.c	2012-08-31 03:39:09.000000000 +1000
+++ lightdm-gtk-greeter-1.3.1.patch/src/lightdm-gtk-greeter.c	2012-09-01 14:55:10.381397437 +1000
@@ -16,6 +16,7 @@
 #include <cairo-xlib.h>
 #include <gdk-pixbuf/gdk-pixbuf.h>
 #include <gdk/gdkx.h>
+#include <glib.h>
 
 #include "lightdm.h"
 
@@ -32,6 +33,10 @@
 static GtkComboBox *language_combo;
 static gchar *default_font_name, *default_theme_name, *default_icon_theme_name;
 static gboolean cancelling = FALSE, prompted = FALSE;
+static gchar **a11y_keyboard_command;
+static int a11y_kbd_pid = 0;
+static GPid *a11y_keyboard_pid = &a11y_kbd_pid;
+static GError *a11y_keyboard_error;
 
 static gchar *
 get_session ()
@@ -378,7 +383,15 @@
     if (lightdm_greeter_get_is_authenticated (greeter))
     {
         if (prompted)
-            start_session ();
+        {
+            if (a11y_kbd_pid != 0)
+            {
+                kill (a11y_kbd_pid, SIGTERM);
+                g_spawn_close_pid(*a11y_keyboard_pid);
+                a11y_kbd_pid = 0;
+            }
+             start_session ();
+        }
     }
     else
     {
@@ -602,6 +615,32 @@
     }
 }
 
+void a11y_keyboard_cb (GtkWidget *widget);
+G_MODULE_EXPORT
+void
+a11y_keyboard_cb (GtkWidget *widget)
+{
+    if (gtk_check_menu_item_get_active (GTK_CHECK_MENU_ITEM (widget)))
+    {
+        if (!g_spawn_async(NULL, a11y_keyboard_command, NULL, G_SPAWN_SEARCH_PATH, NULL, NULL, a11y_keyboard_pid, &a11y_keyboard_error))
+        {
+            g_debug ("a11y keyboard command error : '%s'", a11y_keyboard_error->message);
+            a11y_kbd_pid = 0;
+            g_clear_error(&a11y_keyboard_error);
+            gtk_check_menu_item_set_active (GTK_CHECK_MENU_ITEM (widget), FALSE);
+        }
+    }
+    else
+    {
+        if (a11y_kbd_pid != 0)
+        {
+            kill (a11y_kbd_pid, SIGTERM);
+            g_spawn_close_pid(*a11y_keyboard_pid);
+            a11y_kbd_pid = 0;
+        }
+    }
+}
+
 static void
 sigterm_cb (int signum)
 {
@@ -886,6 +925,13 @@
         g_object_set (gtk_settings_get_default (), "gtk-xft-rgba", value, NULL);
     g_free (value);
 
+    /* Get a11y on screen keyboard command*/
+    gint argp;
+    value = g_key_file_get_value (config, "a11y", "keyboard", NULL);
+    g_debug ("a11y keyboard command is '%s'", value);
+    g_shell_parse_argv (value, &argp, &a11y_keyboard_command, NULL);
+    g_free (value);
+
     builder = gtk_builder_new ();
     if (!gtk_builder_add_from_file (builder, GREETER_DATA_DIR "/greeter.ui", &error))
     {