Comment 10 for bug 854261

I guess I may have found a better explanation about this bug.

Whenever a user is switched in greeter, i.e. a new user selection is made in greeter's user list, LightDM immediately sets its PAM authentication service to either "manual" (set by option [Seat*]/pam-service) or "autologin" (set by option [Seat*]/pam-autologin-service).

When autologin timeout expires, user currently selected in greeter's user list is switched to that one set in [Seat*]/autologin-user option, which in turn sets its PAM authentication service to "autologin", and then performs the login.

However, if the user selected in greeter's user list matches that one set in [Seat*]/autologin-user in the moment autologin timeout expires, then no user switching is performed, and no autologin is triggered.

If my assumption is right, maybe we can fix the bug by forcing lightdm to "switch user to itself" when autologin timeout expires.

Robert, what do you think about it?