Index: lightdm-1.20.0/src/lightdm.c
===================================================================
--- lightdm-1.20.0.orig/src/lightdm.c
+++ lightdm-1.20.0/src/lightdm.c
@@ -1432,6 +1432,8 @@ main (int argc, char **argv)
         config_set_boolean (config_get_instance (), "Seat:*", "allow-guest", TRUE);
     if (!config_has_key (config_get_instance (), "Seat:*", "greeter-allow-guest"))
         config_set_boolean (config_get_instance (), "Seat:*", "greeter-allow-guest", TRUE);
+    if (!config_has_key (config_get_instance (), "Seat:*", "allow-root"))
+        config_set_boolean (config_get_instance (), "Seat:*", "allow-root", TRUE);
     if (!config_has_key (config_get_instance (), "Seat:*", "greeter-show-remote-login"))
         config_set_boolean (config_get_instance (), "Seat:*", "greeter-show-remote-login", TRUE);
     if (!config_has_key (config_get_instance (), "Seat:*", "greeter-session"))
Index: lightdm-1.20.0/src/seat.h
===================================================================
--- lightdm-1.20.0.orig/src/seat.h
+++ lightdm-1.20.0/src/seat.h
@@ -105,6 +105,8 @@ gboolean seat_get_allow_guest (Seat *sea
 
 gboolean seat_get_greeter_allow_guest (Seat *seat);
 
+gboolean seat_get_allow_root (Seat *seat);
+
 gboolean seat_switch_to_greeter (Seat *seat);
 
 gboolean seat_switch_to_user (Seat *seat, const gchar *username, const gchar *session_name);
Index: lightdm-1.20.0/src/seat.c
===================================================================
--- lightdm-1.20.0.orig/src/seat.c
+++ lightdm-1.20.0/src/seat.c
@@ -351,6 +351,13 @@ seat_get_allow_guest (Seat *seat)
     return seat_get_boolean_property (seat, "allow-guest") && guest_account_is_installed ();
 }
 
+gboolean
+seat_get_allow_root (Seat *seat)
+{
+    g_return_val_if_fail (seat != NULL, FALSE);
+    return seat_get_boolean_property (seat, "allow-root");
+}
+
 static gboolean
 run_script (Seat *seat, DisplayServer *display_server, const gchar *script_name, User *user)
 {
@@ -551,6 +558,7 @@ set_greeter_hints (Seat *seat, Greeter *
     greeter_set_hint (greeter, "show-manual-login", seat_get_boolean_property (seat, "greeter-show-manual-login") ? "true" : "false");
     greeter_set_hint (greeter, "show-remote-login", seat_get_boolean_property (seat, "greeter-show-remote-login") ? "true" : "false");
     greeter_set_hint (greeter, "has-guest-account", seat_get_allow_guest (seat) && seat_get_boolean_property (seat, "greeter-allow-guest") ? "true" : "false");
+    greeter_set_hint (greeter, "allow-root-login", seat_get_allow_root (seat) ? "true" : "false");
 }
 
 static void
Index: lightdm-1.20.0/data/lightdm.conf
===================================================================
--- lightdm-1.20.0.orig/data/lightdm.conf
+++ lightdm-1.20.0/data/lightdm.conf
@@ -68,6 +68,7 @@ run-directory=/run/lightdm
 # user-session = Session to load for users
 # allow-user-switching = True if allowed to switch users
 # allow-guest = True if guest login is allowed
+# allow-root = True if root login is allowed
 # guest-session = Session to load for guests (overrides user-session)
 # session-wrapper = Wrapper script to run session with
 # greeter-wrapper = Wrapper script to run greeter with
Index: lightdm-1.20.0/liblightdm-gobject/lightdm/greeter.h
===================================================================
--- lightdm-1.20.0.orig/liblightdm-gobject/lightdm/greeter.h
+++ lightdm-1.20.0/liblightdm-gobject/lightdm/greeter.h
@@ -138,6 +138,8 @@ gboolean lightdm_greeter_get_lock_hint (
 
 gboolean lightdm_greeter_get_has_guest_account_hint (LightDMGreeter *greeter);
 
+gboolean lightdm_greeter_get_allow_root_login_hint (LightDMGreeter *greeter);
+
 const gchar *lightdm_greeter_get_select_user_hint (LightDMGreeter *greeter);
 
 gboolean lightdm_greeter_get_select_guest_hint (LightDMGreeter *greeter);
Index: lightdm-1.20.0/liblightdm-gobject/greeter.c
===================================================================
--- lightdm-1.20.0.orig/liblightdm-gobject/greeter.c
+++ lightdm-1.20.0/liblightdm-gobject/greeter.c
@@ -1174,6 +1174,25 @@ lightdm_greeter_get_has_guest_account_hi
 }
 
 /**
+ * lightdm_greeter_get_allow_root_login_hint:
+ * @greeter: A #LightDMGreeter
+ *
+ * Check if root account can login.
+ *
+ * Return value: #TRUE if root account can login.
+ */
+gboolean
+lightdm_greeter_get_allow_root_login_hint (LightDMGreeter *greeter)
+{
+    const gchar *value;
+
+    g_return_val_if_fail (LIGHTDM_IS_GREETER (greeter), FALSE);
+    value = lightdm_greeter_get_hint (greeter, "allow-root-login");
+
+    return g_strcmp0 (value, "true") == 0;
+}
+
+/**
  * lightdm_greeter_get_select_user_hint:
  * @greeter: A #LightDMGreeter
  *
Index: lightdm-1.20.0/liblightdm-qt/QLightDM/greeter.h
===================================================================
--- lightdm-1.20.0.orig/liblightdm-qt/QLightDM/greeter.h
+++ lightdm-1.20.0/liblightdm-qt/QLightDM/greeter.h
@@ -32,6 +32,7 @@ class Q_DECL_EXPORT Greeter : public QOb
 
     Q_PROPERTY(QString hostname READ hostname CONSTANT)
     Q_PROPERTY(bool hasGuestAccount READ hasGuestAccountHint CONSTANT)
+    Q_PROPERTY(bool allowRootLogin READ allowRootLoginHint CONSTANT)
     Q_PROPERTY(bool locked READ lockHint CONSTANT)
 
     Q_PROPERTY(QString hostname READ hostname CONSTANT)
@@ -59,6 +60,7 @@ public:
     bool showRemoteLoginHint() const;
     bool lockHint () const;
     bool hasGuestAccountHint() const;
+    bool allowRootLoginHint() const;
     QString selectUserHint() const;
     bool selectGuestHint() const;
     QString autologinUserHint() const;
Index: lightdm-1.20.0/liblightdm-qt/greeter.cpp
===================================================================
--- lightdm-1.20.0.orig/liblightdm-qt/greeter.cpp
+++ lightdm-1.20.0/liblightdm-qt/greeter.cpp
@@ -257,6 +257,12 @@ bool Greeter::hasGuestAccountHint() cons
     return lightdm_greeter_get_has_guest_account_hint(d->ldmGreeter);
 }
 
+bool Greeter::allowRootLoginHint() const
+{
+    Q_D(const Greeter);
+    return lightdm_greeter_get_allow_root_login_hint (d->ldmGreeter);
+}
+
 QString Greeter::selectUserHint() const
 {
     Q_D(const Greeter);