Comment 1 for bug 1195762

I don't know if we have the same problem. Look this scenary:

  Session130:
        realname = 'name of the user 1'
        x11-display = ':2'
        x11-display-device = '/dev/tty7'
        is-local = TRUE

  Session163:
        realname = 'Light Display Manager'
        x11-display = ':4'
        x11-display-device = '/dev/tty8'
        is-local = TRUE

  Session162:
        realname = 'name of the user 2'
        x11-display = '10.0.0.4:1'
        x11-display-device = '10.0.0.4:1'
        is-local = FALSE

The session 162 is a Xming connection from a notebook at local net.
The session 130 is a Unity-2D session from local seat (beside the CPU).
The session 163 was the local seat of an "user 3" who closed his Unity session.
There aren't x11-display :0 or :1 because they were Unity sessions (local) that were closed.

Attention! If the user 1 close his session, the local monitor turns blank and the machine (local keyboard and mouse) inoperable. It returns to normal (rekindling the local monitor with a "Light Display Manager" on tty7) only if I execute a "sudo service lightdm restart" via SSH, losing all sessions graphic.