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[Jason <jasonmacaree@xxxxxxxxxxxxxx>]

I am experiencing this problem on Natty. I recently re-installed, but
initially didn't experience the problem. It has only been the last few
days that this very annoying bug has  hit me. I have tried lots of
"fixes" but still have screen to black to full desktop all the time.

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https://bugs.launchpad.net/bugs/779639

Title:
  gnome screensaver activation is hindered by unobscure routine

Status in GNOME Screensaver:
  New
Status in OEM Priority Project:
  Confirmed
Status in OEM Priority Project oneiric series:
  New
Status in “gnome-screensaver” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: gnome-screensaver

  The problem occurs in Natty, using the Unity desktop.  I have not
  tried the old-style desktop to see if it also affects that.

  https://bugzilla.gnome.org/show_bug.cgi?id=649755

  I have reported upstream a bug in Gnome Screensaver that is preventing
  my screensaver from activating during session timeout.  The symptom is
  that the session times out, the screen fades to black, and then
  immediately returns to the desktop.  The symptoms are similar to Bug
  #241206 and Bug #363635, but the cause is different than those bugs.

  Summary of upstream bug report:

  The problem is caused in gs-manager.c by the function
  window_obscured_cb.  This function is called when the screensaver
  window is obscured (i.e., when fast user switching swaps to another
  VT) or unobscured (i.e., switching back to the VT).  In addition to
  attempting to disable or re-enable the screensaver animation, when the
  screensaver is unobscured the callback automatically makes a request
  to unlock the screen.  This saves the user from having to press a key
  or wave their mouse around to bring up the unlock dialog.

  My problem is that, for reasons I do not understand, my screensaver thinks, every time it activates due to session timeout, that its window is obscured briefly.  window_obscured_cb is called twice in rapid succession, once for obscure, then again for unobscure.  Because I do not use the screensaver lock feature, this means that, on the unobscure call, the screensaver is
  deactivated.  Thus, my screensaver will never activate due to a session timeout.

  I have verified that the obscured window event is the reason for the
  screensaver deactivation using the debugging output.

  I have attached a patch in the upstram bug report that fixes the
  problem by removing the line that calls the screensaver unlock
  automatically as a result of an unobscure event.

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