Description of problem:

If automatic logon is enabled, and you log out from within GNOME, you get dumped to a VTY and X does not respawn.


Version-Release number of selected component (if applicable):

gdm-3.16.2-1.fc22.x86_64


How reproducible:

Reproducible on two machines (one freshly installed Fedora 22, the other upgraded over several years), both of which have one graphical user (me).


Steps to Reproduce:
1. Enable automatic logon either through the GNOME GUI, or add this to /etc/gdm/custom.conf:

   [daemon]
   AutomaticLoginEnable=True
   AutomaticLogin=foobar

2. Make sure log out menu is enabled:

   $ gsettings set org.gnome.shell always-show-log-out true

3. Restart GDM and make sure automatic logon works

   # systemctl restart gdm.service

4. Make sure automatic logon works

5. Log out of session (either through Shell or `killall gnome-session`)


Actual results:

Session logs out, but user gets dumped to VTY screen with no graphical way to proceed.  Running "ps aux" shows that GDM is running, but X is not running.  Logs show nothing obvious wrong (other than X terminating normally).


Expected results:

I would expect to see the GDM greeter screen appear after logging out, whether or not I logged on via automatic logon.