Log in prompt appears twice or three times after suspend

Hi,

since my update to 14.04.1 LTS I experience difficulties with unlocking my screen after waking up my maschine. After logging the desktio is shown only for a short moment, following another screen lock. I have to unlock the screen again then. This happens after every suspend, sometimes even three times.

I am happy to provide additional data.

cheers

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: lightdm 1.10.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8
Uname: Linux 3.13.0-39-generic i686
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: i386
CurrentDesktop: Unity
Date: Tue Nov 18 17:03:00 2014
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-01-13 (673 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release i386 (20121017.2)
LightdmConfig:
 [SeatDefaults]
 user-session=ubuntu
 greeter-session=unity-greeter
 allow-guest=true
ProcEnviron:
 LANGUAGE=de_DE
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: lightdm
UpgradeStatus: Upgraded to trusty on 2014-09-14 (64 days ago)