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[Pascal Opitz <contact@xxxxxxxxxxxxxxx>]

Same behaviour in 15.10

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https://bugs.launchpad.net/bugs/1416897

Title:
  static image of desktop and windows displayed instead of lockscreen

Status in gnome-screensaver package in Ubuntu:
  Confirmed

Bug description:
  This is a follow-on from bug 1375271(
  https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1375271 ), though
  it may actually implicate a different underlying problem.

  .

  Expectation --

  Given any one of the following actions:
   - (from active desktop session) choosing "lock" from the Unity Panel power menu;
   - (from locked session with screen turned off): using mouse movement, keystrokes, etc. to poke the screen awake; or
  - (from suspend) initiating a resume,

  ...the expected result is to display an interactive lockscreen where
  the active user's password can be entered to access the session. On
  this particular machine, which is a touch hybrid, the lockscreen also
  includes the Onboard soft keyboard.

  .

  Observed behavior --

  Instead of the lockscreen, each of these actions triggers the machine
  to display an image of the desktop/window session as it had been near
  the time of the lock or suspend.  The cursor is visible and can be
  moved.  The Unity Panel and Launcher usually appear as normal,
  although sometimes they are missing.

  Nothing happens when the user attempts to interact with the visible
  session by mouse or keyboard input.  Keyboard input will actually be
  fed to the lockscreen's password entry window, however.  So blindly
  typing the password from the zombie GUI session image -- and then
  pressing "enter" -- will bring up an active, working session.

  TTY session logins are available by the keyboard shortcuts ctrl-
  alt-F[number].  After pulling up one of these login screens (without
  actually logging in), then returning with ctrl-alt-F7, the lockscreen
  appears as expected.

  .

  Regression timeframe:

  I believe this behavior began sometime during January 2015.

  .

  Replication:

  This unexpected behavior takes place almost every time one of the
  listed actions is taken.  During one period of testing on 2015-01-31,
  the bug disappeared for a few rounds of lock and unlock. However, it
  re-appeared shortly thereafter (I believe after the next restart or
  suspend-resume).

  .

  Video attachment:

  A 1-minute video (.webm, no audio) is attached showing one form of
  this bug (simple lock-unlock).  The main feed was taken from a
  smartphone, but the video also includes an inset of what
  SimpleScreenRecorder (SSR) "saw" during the process.

  On "lock", the actual screen became fully black. SSR, by contrast, recorded a black screen that included a clock in the top-right.
  On mouse movement, the actual screen displayed the static image of the GUI/desktop session. SSR, by contrast, recorded a delayed but normal lockscreen appearing.

  .

  Security tag reasoning:

  This bug displays a snapshot of recent  screen contents from a user's
  GUI session even when the user has (actively or indirectly) locked the
  session.  It also prevents a user from turning on the screen to
  command a user switch, go into TTY, etc. without displaying an image
  of her private GUI session.

  .

  Current graphics-related system info:

  OEM: HP Envy x360 15t (convertible hybrid notebook)
  CPU/GPU: Intel(R) Core(TM) i7-4510U CPU @ 2.00GHz | Intel HD Graphics 4400
  OpenGL Core Profile version: 3.3 Mesa 10.5.0-devel
  OpenGL Extensions version: 3.0 Mesa 10.5.0-devel
  OS: Ubuntu 14.10 64-bit
  Kernel: 3.16.0-29 generic
  X Server: xorg-server 2:1.16.1.901-1ubuntu1~utopic1
  Pixman version: 0.32.4
  Compiz version: 0.9.12

  Please let me know if there is further config information that would
  be helpful.

  .

  Upstream testing:

  This is a production machine. I am willing to test pre-release
  packages provided the testing configurations are easy to revert (such
  as upstream kernels).  I have been burned in the past with broken
  package systems and protracted  config repairs after testing
  experimental graphics and video driver software. But I would still be
  willing give it a shot if there is a simple and reliable process to
  roll back the changes.

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