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[Launchpad Bug Tracker <1666359@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package unity - 7.4.5+16.04.20171201.3

---------------
unity (7.4.5+16.04.20171201.3) xenial; urgency=medium

  [ Marco Trevisan (Treviño) ]
  * InputMonitor: add an unity class that monitors XInput2 events and
    converts them to XEvent
  * EdgeBarrierController: use InputMonitor to get the barrier events
    instead of relying on its implementation
  * DecorationsMenuLayout: use input monitor for menu scrubbing (LP:
    #1614597)
  * PanelView: use InputMonitor to track menu events
  * LockScreenPanel: use InputMonitor events instead of mouse polling
    for menu scrubbing
  * MenuManager: add support for mouse trackers with triangle algorithm
    support (LP: #1618405)
  * PanelView: scale gradient refinement properly
  * PanelService: don't allow to deactivate menus if they've been opened
    too shortly
  * LockScreenController: ignore icon_paths_changed signal in
    menumanager for Lockscreen
  * LockScreenController: use InputMonitor to get all the events and
    hide the Blank Window (LP: #1321075)
  * LockScreenController: use input monitor to get the events to switch
    monitor (LP: #1316862)
  * LauncherOptions: use track_obj to manage option changes (LP:
    #1622995)
  * UnityScreen: toggle gestures recognition on lock (LP: #1645507)
  * GnomeSessionManager: add gcancellable to instance and use it for
    calls with temporary proxies
  * BackgroundSettings: use gnome-bg to generate textures with proper
    scaling (LP: #1666359)
  * UnityWindow: safely check validity of UnityWindow from scaled one
    (LP: #1659847)
  * Panel: ensure the menu-manager tracker is updated to match monitor
    (LP: #1671432)
  * compiz-profile-setter: tool to update the current profile and use in
    systemd and Unity settings (LP: #1668950)
  * BGHash, UnityScreen: get desktop averageColor from compiz
  * Launcher: disable or reduce most icon effects on lowgfx (LP:
    #1700859)
  * PanelController: ensure we disconnect from signals on destruction
    (LP: #1504870)
  * tools: add migration script to set the default values for unity-
    lowgfx profile

  [ Andrea Azzarone ]
  * Properly handle the file manager copy dialog in
    FileManagerLauncherIcon and in StorageLauncherIcon. (LP: #1575452,
    LP: #1609845)
  * Correctly position the force quit dialog when scaling is different
    than 1.0 (LP: #1637991)
  * GnomeSession: Retrieve the session id using dbus if $XDG_SESSION_ID
    is not set
  * Round gtk scaling factor to closest integer. (LP: #1649736)
  * Keep the screen locked if rebooting with autologin. (LP: #1600389)
  * Use g_mkdir_with_parents instead of mkdir.
  * Lockscreen: always draw the background-color in the lockscreen (LP:
    #1702701)
  * Refactor the way UserAuthenticator is created and passed around.
    Handle failures to create new threads and fallback to a "Switch to
    greeter..." button in case of failure. (LP: #1311316)
  * Wait until the color buffer is cleared before suspending. (LP:
    #1532508)

  [ Kai-Heng Feng ]
  * UnitySettings: If scale-factor is not set, find and set right scale
    for HiDPI displays.

  [ Eleni Maria Stea ]
  * shouldn't create blur rectangles when there's no blur, skips the
    blur rects processing in low gfx.
  * removes lowgfx option from ccsm, reads the "lowgfx" gsetting (LP:
    #1668950)

  [ Nick Dedekind ]
  * Fixed tooltip scaling issues. (LP: #1673950)

 -- Marco Trevisan (Treviño) <mail@xxxxxxxxx>  Fri, 01 Dec 2017 18:46:01
+0000

** Changed in: unity (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1666359

Title:
  Lock screen doesn't cover entire desktop on HiDPI display with draw-
  user-backgrounds unchecked

Status in unity package in Ubuntu:
  Fix Released
Status in unity source package in Xenial:
  Fix Released

Bug description:
  Ubuntu 16.04.2 LTS using Unity
  unity-greeter 16.04.2-0ubuntu1

  [Impact]
  On a HiDPI monitor on a Dell XPS 13 9343 laptop, if you uncheck com.canonical.unity-greeter -> draw-user-backgrounds and then lock the desktop:

  Expected: the purple placeholder wallpaper should cover the entire desktop
  Observed: the purple placeholder wallpaper only covers the top-left part of the desktop

  I'm attaching an image showing roughly what the desktop looks like
  when it's locked. The green rectangle is the part covered by the
  purple wallpaper, the red is stuff that should not be visible when
  locked, and the yellow is the usual name/password entry box that is
  partially transparent.

  I'm marking this bug as a security vulnerability because it allows
  someone to see part of a user's desktop even when the desktop is
  locked.

  [Test Case]
  1. Make sure to use an HiDPI monitor
  2. Open terminal
  3. gsettings set com.canonical.unity-greeter draw-user-backgrounds false
  4. Lock the screen
  5. Make sure the background is properly drawn.

  [Potential Regression]
  Make sure lockscreen background is drawn properly on an non-HiDPI monitor too. Also make sure that when using "draw-user-backgrounds == true" the background is properly drawn.

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