*** This bug is a duplicate of bug 160264 ***
https://bugs.launchpad.net/bugs/160264
This is actually caused by when the screen "locks" from your user that
you were switching from.
** This bug has been marked a duplicate of bug 160264
[nvidia] compiz displays white screen when locked
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gdm Interface does not return when second user logs out.
https://bugs.launchpad.net/bugs/218349
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