Index: b/src/libaccountsservice/act-user-manager.c
===================================================================
--- a/src/libaccountsservice/act-user-manager.c	2019-09-11 17:40:53.726949739 +0800
+++ b/src/libaccountsservice/act-user-manager.c	2019-09-11 17:41:00.547007450 +0800
@@ -1752,12 +1752,22 @@ maybe_add_new_session (ActUserManagerNew
         if (new_session->x11_display == NULL) {
                 g_debug ("AcUserManager: (mostly) ignoring session '%s' since it's not graphical",
                          new_session->id);
-                is_ours = FALSE;
+                /* SLE: ignore non-graphical session completely */
+                /* see `act_user_is_logged_in_anywhere` */
+                unload_new_session (new_session);
+                return;
         } else if (session_is_login_window (manager, new_session->id)) {
                 new_session->state = ACT_USER_MANAGER_NEW_SESSION_STATE_LOADED;
                 unload_new_session (new_session);
                 return;
         } else if (!session_is_on_our_seat (manager, new_session->id)) {
+                /**
+                 * NOTE: if `manager->priv->seat.id` or `new_session->id` is
+                 * either NULL, it's not on our seat: this is reasonable, as
+                 * non-seat session is not switchable and thus no need to be
+                 * ours. However, this nondiscrimination for all non-seated
+                 * sessions is possibly a source for bugs.
+                 */
                 is_ours = FALSE;
         }
 
Index: b/src/libaccountsservice/act-user.c
===================================================================
--- a/src/libaccountsservice/act-user.c	2019-09-11 17:40:53.726949739 +0800
+++ b/src/libaccountsservice/act-user.c	2019-09-11 17:41:00.547007450 +0800
@@ -868,6 +868,8 @@ act_user_is_logged_in (ActUser *user)
  * (Currently, this function is only implemented for systemd-logind.
  * For ConsoleKit, it is equivalent to act_user_is_logged_in.)
  *
+ * (SLE-12 SP2: 'other_sessions' have been modified to contain only X sessions)
+ *
  * Returns: %TRUE or %FALSE
  */
 gboolean
@@ -896,6 +898,24 @@ act_user_get_saved (ActUser *user)
 }
 
 /**
+ * act_user_is_x_logged_in_remotely:
+ * @user: a #ActUser
+ *
+ * Returns whether or not #ActUser is currently graphically logged in on a
+ * different seat or no seat.
+ *
+ * (For SLE12-SP2: fate#318433)
+ *
+ * Returns: %TRUE or %FALSE
+ */
+gboolean
+act_user_is_x_logged_in_remotely (ActUser *user)
+{
+        /* return user->remote_x_sessions; */
+        return (user->other_sessions != NULL);
+}
+
+/**
  * act_user_get_locked:
  * @user: a #ActUser
  *
Index: b/src/libaccountsservice/act-user.h
===================================================================
--- a/src/libaccountsservice/act-user.h	2019-09-11 17:40:53.726949739 +0800
+++ b/src/libaccountsservice/act-user.h	2019-09-11 17:41:00.547007450 +0800
@@ -67,6 +67,7 @@ guint          act_user_get_num_sessions
 guint          act_user_get_num_sessions_anywhere (ActUser   *user);
 gboolean       act_user_is_logged_in              (ActUser   *user);
 gboolean       act_user_is_logged_in_anywhere     (ActUser   *user);
+gboolean       act_user_is_x_logged_in_remotely   (ActUser   *user);
 int            act_user_get_login_frequency       (ActUser   *user);
 gint64         act_user_get_login_time            (ActUser   *user);
 const GVariant*act_user_get_login_history         (ActUser   *user);