Comment 8 for bug 40011

Created /etc/gdm/custom.conf:
[daemon]
[security]
[xdmcp]
[greeter]
[chooser]
[debug]
Enable=true

Rebooted.

Loged in three users. Logged them out one by one. Attached is what was logged in /var/log/daemon.log when the last user was logging out and the screen was left at a blank VT

After that I ran these commands:
$ sudo fgconsole
9
$ ck-list-sessions
Session14:
 unix-user = '114'
 realname = 'Gnome Display Manager'
 seat = 'Seat1'
 session-type = 'LoginWindow'
 active = FALSE
 x11-display = ':0'
 x11-display-device = '/dev/tty8'
 display-device = ''
 remote-host-name = ''
 is-local = TRUE
 on-since = '2010-05-13T17:22:28.408652Z'
 login-session-id = '4294967295'
Session7:
 unix-user = '1000'
 realname = 'sysadmin'
 seat = 'Seat2'
 session-type = ''
 active = FALSE
 x11-display = ''
 x11-display-device = ''
 display-device = '/dev/ssh'
 remote-host-name = 'cheren.int.willystreet.coop'
 is-local = FALSE
 on-since = '2010-05-13T17:17:06.784808Z'
 login-session-id = '4294967295'