Blocked password prompt in Unity lock screen

[Andri Yngvason]

Sometimes when I lock the screen, I can't get in again. I have to press Ctrl+Alt+F1 and kill X or reboot to get in again.

The problem is actually that I can't type in the password because the text input field is no longer there. See attached picture.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: unity 7.2.2+14.04.20140714-0ubuntu1.1
ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
Uname: Linux 3.13.0-35-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.3
Architecture: i386
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CurrentDesktop: Unity
Date: Wed Sep 3 14:25:34 2014
InstallationDate: Installed on 2014-07-10 (55 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release i386 (20140417)
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Andri Yngvason (andryng)]

I'm using two screens and I've found that usually this blocks on one screen first, and if I move the mouse to the other screen, it's not blocked on that screen. But if I move the mouse between the screens again it blocks. Both screens will be blocked after I lock the screen after the "one screen blocked" situation.

I've also figured out that, when I notice this happening on the one screen, I can log in on the other and, using xkill, kill the top bar (status bar?) and that will keep this from happening next time.