Comment 134 for bug 160264

Just thought I'd add this:

I just tried locking my screen as User1. The screen-saver started running. I hit ESC to exit the screen-saver and log back in. I was prompted with the standard unlock login prompt (no white screen).

At this screen I chose "Switch User" instead of logging in. I was prompted through the GDM login screen for a username and password. I entered User2 / password and was dropped into User2's desktop immediately (as if I had switched users; i.e. it didn't login a new User2 session, but rather switched me to User2 --this all seems correct).

At this point I switched back to User1 and was prompted with User1's unlock screen --NOT the white screen. I was able to unlock the screen with User1's password and was back to User1's desktop.

My reason for mentioning this is because it seems that when I went from the unlock screen (where U1's screen was locked), I was able to return without the white screen. When I go directly from my desktop and switch users, I return to the white screen. I'm hoping that this will help to isolate the offending code.

To tie this into the permissions idea; the locked screen prompt is publicly visible, while my desktop isn't. ?? M'eh. Just a thought. Anyway, I hope this helps shed some light.