The new Unity lock screen doesn't have problem with application grabbing the mouse (indicators, menus, etc.) but only if the mouse cursor is outside of that menu. When you open menu of application (global or LIM) or indicator then move the cursor outside of that menu and application the screen will blank off and lock.
When you have open indicator or menu of application (global or LIM) and mouse is focused on that menu the screen will not blank off and of course it will also not lock. This is still a bug in gnome-screensaver and X server just like the one that you linked because the new Unity lock screen still uses gnome- screensaver. -- You received this bug notification because you are a member of DX Packages, which is subscribed to unity in Ubuntu. Matching subscriptions: dx-packages https://bugs.launchpad.net/bugs/1292446 Title: lockscreen: on autolock on suspend the fade does not complete before suspend leaving desktop partially visible for a short period on resume Status in Unity: New Status in “unity” package in Ubuntu: New Bug description: When auto-locking as part of a suspend operation the lock screen still fades to opaque, this takes seconds and mid fade the suspend occurs. This means that on waking the machine the fade is still occurring and the desktop is partially visible potentially exposing information protected by the lock. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: unity 7.1.2+14.04.20140313-0ubuntu1 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: Fri Mar 14 10:02:52 2014 EcryptfsInUse: Yes InstallationDate: Installed on 2013-06-20 (266 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130618) SourcePackage: unity UpgradeStatus: Upgraded to trusty on 2013-11-10 (123 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/1292446/+subscriptions -- Mailing list: https://launchpad.net/~dx-packages Post to : dx-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~dx-packages More help : https://help.launchpad.net/ListHelp