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[Alberto Salvia Novella <es20490446e@xxxxxxxxx>]

** Changed in: unity (Ubuntu)
   Importance: Undecided => Medium

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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:
  In Progress
Status in “unity” package in Ubuntu:
  In Progress

Bug description:
  This appears to be a regression in 14.10 sometime in September 2014.

  The behavior appears similar to this bug from 2011:
  https://bugs.launchpad.net/unity-2d/+bug/830348

  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).

  I have not exhaustively tested conditions in which this appears.
  However, just now, the bug did not appear when keeping the lid open,
  suspending, and then resuming with the power button.

  But when suspending from menu, closing the lid, then opening the lid
  and moving the mouse, the screen displayed contents before showing the
  lock dialog.  The image displayed was of the desktop (with this bug
  reporting window) and showed the "suspend" item in the power menu
  being highlighted/clicked.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: unity 7.3.1+14.10.20140915-0ubuntu1
  ProcVersionSignature: Ubuntu 3.16.0-18.25-generic 3.16.3
  Uname: Linux 3.16.0-18-generic x86_64
  ApportVersion: 2.14.7-0ubuntu2
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CurrentDesktop: Unity
  Date: Mon Sep 29 08:38:57 2014
  InstallationDate: Installed on 2014-08-10 (50 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  SourcePackage: unity
  UpgradeStatus: Upgraded to utopic on 2014-08-10 (50 days ago)

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