Comment 17 for bug 848562

The same thing happens again on 12.10 using 2 monitors and gdm instead of lightdm. the behavior is:
(note that I have synergy setup as well)

* CTRL+ALT+L to lock the screen
* "curtain" effect rolls down showing the clock
* press ESC so the curtain moves up to be able to type the password, but nothing happens (with any other key either)
* the clock and mouse can move freely and I can move the mouse to other screens on other desktops via synergy!

My workaround for this is:

1. press CTRL+ALT+F2
2. type "restart"
3. press ENTER

After that the desktop shows fine and all my virtual desktops are collapsed into 1, but all programs keep running.