Autolocking and LDAP is not the problem. It is very often, but not every time, when I press Crtl + Alt + L, move the mouse, press ESC and move the mouse again.
If it is happen, the only way to show the unlock dialog again is move the mouse into the black screen and press ESC. It is not completely reproducible, sorry! -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org