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[Bug 1375271] Re: desktop or other past screen contents visible before lockscreen on resume

 

Accepted unity into trusty-proposed. The package will build now and be
available at
http://launchpad.net/ubuntu/+source/unity/7.2.4+14.04.20141217-0ubuntu1
in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed. Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed. In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in
advance!

** Changed in: unity (Ubuntu Trusty)
       Status: New => Fix Committed

** Tags added: verification-needed-trusty

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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:
  New
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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