Comment 9 for bug 224448

I found a method to replicate the problem or at least it works for me (Dell XPS M1330 with nVidia drivers)

Log into Gnome, then hit the power off icon and choose "switch user", on the login screen hit the Options button and choose Quit... my screen goes off, then powers on on black, then goes white with password field in the middle (i can "see" it because of mouse pointer changin from arrow to caret)