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[Matthias Geheim <ubuntuone@xxxxxxxxxxxxxxxxx>]

I've got unity 7.2.2+14.04.20140714-0ubuntu1 installed and sometimes
(~every 3rd time) i'm still able to perform keyboard inputs to
applications, when the screen is locked. When this happens, I can't type
to the password field. I have to klick around on the indicators, to get
focus back to lockscreen.

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https://bugs.launchpad.net/bugs/1291547

Title:
  Locking the screen doesn't really lock under certain circumstances

Status in Unity:
  Fix Released
Status in “unity” package in Ubuntu:
  Fix Released

Bug description:
  When the screen is locked while an action causes a window to gain
  focus, it allows full keyboard interaction with the locked session. I
  was able to trigger this behaviour doing one of the following:

  * Changing to a desktop with at least one window on it and, without releasing Ctrl+Alt, pressing L to lock the screen
  * While dragging a window, lock the screen using the keyboard shortcut
  * While Alt+Tab-ing, lock the screen without releasing the Alt key

  In all cases, a window can gain focus after the screen was locked and all keyboard input goes to that window. Also, the window switcher remains fully functional and even shows the window previews like it would normally. It's even possible to open applications using keyboard shortcuts, for example a terminal.
  To enter the password and unlock the session, the password field needs to be focused by opening and closing an indicator in the lockscreen and then clicking the password field.

  While most of these actions aren't something a normal user would do,
  they clearly show that the new lockscreen is far less secure than the
  old one. The first trigger action is even something I've done in the
  past during normal use, switching to a desktop and then locking the
  session, so I would say there is at least a small "real" security risk
  in this.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unity 7.1.2+14.04.20140311-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-17.37-generic 3.13.6
  Uname: Linux 3.13.0-17-generic x86_64
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CurrentDesktop: Unity
  Date: Wed Mar 12 18:36:09 2014
  InstallationDate: Installed on 2014-02-24 (16 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140223)
  SourcePackage: unity
  UpgradeStatus: No upgrade log present (probably fresh install)

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