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[Mateusz Stachowski <1375271@xxxxxxxxxxxxxxxxxx>]

I made some tests but not on real hardware. I used VirtualBox.

I didn't have any of the problems described in this bug report. I
checked with a couple of windowed programs and then with Firefox in
fullscreen and the last test was with Evince in fullscreen. When I
resumed the only thing that displayed was lockscreen (no view of the
desktop or it's past contents).

Adam in his comment didn't specify the version of Unity and I assume he
isn't using the version from -proposed.

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https://bugs.launchpad.net/bugs/1375271

Title:
  desktop or other past screen contents visible before lockscreen on
  resume

Status in GNOME Screensaver:
  Invalid
Status in Unity:
  Fix Committed
Status in Unity 7.2 series:
  In Progress
Status in unity package in Ubuntu:
  Fix Released
Status in unity source package in Trusty:
  Fix Committed

Bug description:
  [Impact]

  On resume from suspend, screen contents are displayed for a brief time
  (perhaps 0.5 to 1 sec)  before the lock dialog appears.

  These screen contents are not always the desktop or open application
  beneath the lock screen. On at least one occasion, the screen showed
  content from a full-screen video that had been playing in Firefox some
  time before the computer had been suspended: neither the video nor its
  underlying tab were open anymore, so the image(s) was likely part of a
  buffer somewhere. (Needless to say, if the wrong full-screen video had
  been watched, depending on the setting, this could be a quite serious
  issue for some users).

  [Test Case]

  Suspend and resume the computer (closing the lid or using the session
  indicator).  Since this problem involves a race condition, it is not
  reliably reproducable at will.

  [Regression Potential]

  This fix unmaps windows when a suspend or shutdown event occurs:  it
  is possible that the window(s) do not get remapped when a wake event
  occurs, or the wake even does not get propagated.  This does not
  appear to occur in practice.

  [Other Info]

  The Ubuntu 14.04 LTS SRU was cherry-picked from upstream Unity where
  it has been released in the Ubuntu "Vivid Vervet" development release
  for a couple of months with no apparent regressions.

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