I have the same issue here, Ubuntu 14.04.1 64bit (3.13.0-33-generic) with Unity, using Dual screen and NVS 300, Nvidia proprietory drivers v 340.24.
Sometimes in the past I was able to get the input password box to appear when I was moving the mouse around from one screen to another. This was causing the login box to change screens and sometimes the input would come back. Lately this doesn't work for me any more, and the only work around is the unity --replace command from a terminal. I also noticed that when I come back to my session my gnome-terminal is completely lost in the background and if it was minimized I cannot bring it back. I don't know if this is related. -- 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/1311316 Title: After locking screen there is no input field to type password for unlock Status in Unity: Triaged Status in “unity” package in Ubuntu: Confirmed Bug description: Sometimes (but not always) after locking the screen there is the situation not having any input field where I can type the password to unlock the session again. The shaded gray area simply does not have the input field. I can't do anything, I have to switch to text console and stop/start lightdm service to cure the problem loosing all of my session :( ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: unity 7.2.0+14.04.20140416-0ubuntu1 ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9 Uname: Linux 3.13.0-24-generic i686 ApportVersion: 2.14.1-0ubuntu3 Architecture: i386 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CurrentDesktop: Unity Date: Tue Apr 22 22:17:57 2014 InstallationDate: Installed on 2012-03-03 (780 days ago) InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1) SourcePackage: unity UpgradeStatus: Upgraded to trusty on 2013-10-18 (186 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/1311316/+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