From 903dd62114d24a90fe55a7cf42ea07233fe71879 Mon Sep 17 00:00:00 2001
From: Ray Strode <rstrode@redhat.com>
Date: Mon, 29 Oct 2018 06:57:59 -0400
Subject: [PATCH] local-display-factory: pause for a few seconds before
 falling back to X

logind currently gets confused if a session is started immediately as
one is shutting down.

Workaround this problem by adding an artificial delay when falling
back to X.

http://bugzilla.redhat.com/1643874
---
 daemon/gdm-local-display-factory.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/daemon/gdm-local-display-factory.c b/daemon/gdm-local-display-factory.c
index eba38671..948c5d98 100644
--- a/daemon/gdm-local-display-factory.c
+++ b/daemon/gdm-local-display-factory.c
@@ -653,60 +653,67 @@ ensure_display_for_seat (GdmLocalDisplayFactory *factory,
         preferred_display_server = get_preferred_display_server (factory);
 
         if (g_strcmp0 (preferred_display_server, "none") == 0) {
                g_debug ("GdmLocalDisplayFactory: Preferred display server is none, so not creating display");
                return;
         }
 
         ret = sd_seat_can_graphical (seat_id);
 
         if (ret < 0) {
                 g_critical ("Failed to query CanGraphical information for seat %s", seat_id);
                 return;
         }
 
         if (ret == 0) {
                 g_debug ("GdmLocalDisplayFactory: System doesn't currently support graphics");
                 seat_supports_graphics = FALSE;
         } else {
                 g_debug ("GdmLocalDisplayFactory: System supports graphics");
                 seat_supports_graphics = TRUE;
         }
 
         if (g_strcmp0 (seat_id, "seat0") == 0) {
                 is_seat0 = TRUE;
 
                 falling_back = factory->num_failures > 0;
                 session_types = gdm_local_display_factory_get_session_types (factory, falling_back);
 
                 g_debug ("GdmLocalDisplayFactory: New displays on seat0 will use %s%s",
                          session_types[0], falling_back? " fallback" : "");
+
+               if (falling_back) {
+			/* workaround logind race for now
+			 * bug 1643874
+			 */
+			g_usleep (2 * G_USEC_PER_SEC);
+               }
         } else {
                 is_seat0 = FALSE;
 
                 g_debug ("GdmLocalDisplayFactory: New displays on seat %s will use X11 fallback", seat_id);
                 /* Force legacy X11 for all auxiliary seats */
                 seat_supports_graphics = TRUE;
                 session_types = g_strdupv ((char **) legacy_session_types);
         }
 
         /* For seat0, we have a fallback logic to still try starting it after
          * SEAT0_GRAPHICS_CHECK_TIMEOUT seconds. i.e. we simply continue even if
          * CanGraphical is unset.
          * This is ugly, but it means we'll come up eventually in some
          * scenarios where no master device is present.
          * Note that we'll force an X11 fallback even though there might be
          * cases where an wayland capable device is present and simply not marked as
          * master-of-seat. In these cases, this should likely be fixed in the
          * udev rules.
          *
          * At the moment, systemd always sets CanGraphical for non-seat0 seats.
          * This is because non-seat0 seats are defined by having master-of-seat
          * set. This means we can avoid the fallback check for non-seat0 seats,
          * which simplifies the code.
          */
         if (is_seat0) {
                 if (!seat_supports_graphics) {
                         if (!factory->seat0_graphics_check_timed_out) {
                                 if (factory->seat0_graphics_check_timeout_id == 0) {
                                         g_debug ("GdmLocalDisplayFactory: seat0 doesn't yet support graphics.  Waiting %d seconds to try again.", SEAT0_GRAPHICS_CHECK_TIMEOUT);
                                         factory->seat0_graphics_check_timeout_id = g_timeout_add_seconds (SEAT0_GRAPHICS_CHECK_TIMEOUT,
-- 
2.27.0