*** This bug is a duplicate of bug 45018 ***
** This bug has been marked a duplicate of bug 45018
Unlock screen is invisible with Nvidia twinview
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With multiple monitors, screen can be locked, but unlock dialog won't appear
https://launchpad.net/bugs/62983
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ubuntu-bugs mailing list
After a little research, it appears that gnome-screensaver is
responsible for locking, so I am moving this bug.
I can trigger the locking by running
gnome-screensaver-command --lock
Also, I notice that I can still interact with my desktop even though the
screen is black. It's as if