Just tried 4.0.0 , and on first try I triggered this issue.  I was,
however, able to kill gnome-setting-daemon and then gnome-shell from a
terminal.  This then caused the lock screen to appear and I was able to
log in.  I've had this happen sometimes in the past before, so I
consider this no change.

No suspect messages in dmesg or Xorg.0.log

** Tags added: kernel-bug-exists-upstream

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https://bugs.launchpad.net/bugs/1442311

Title:
  Ubuntu 14.04 blank screen after wakeup from sleep

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