This is likely what happens:

1- Something grabs mouse: ie: virtual machine window, or GTK menu in an 
application or an indicator
2- Screensaver attempts to start, but cannot get exclusive lock on mouse
3- DPMS turns monitor black
4- User moves mouse, which turns the screen back on
5- Mouse movement causes mouse to get ungrabbed by vm window or gtk menu
6- Screensaver can now grab mouse, and starts

This is all related to the fact that X does not have an API that will
let the screensaver tell an application to release mouse and keyboard
grabs.

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You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is subscribed to gnome-screensaver in Ubuntu.
https://bugs.launchpad.net/bugs/830348

Title:
  desktop contents briefly visible on resume from suspend before lock
  dialog

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https://bugs.launchpad.net/unity/+bug/830348/+subscriptions

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