Public bug reported:

With fprintd/libpam_fprintd installed, the user can in all places authenticate 
via the fingerprint reader. (Command line, login screen, light locker screen). 
However, light locker does not interact well with fingerprint authentication:
Immediately after locking the session, the user can unlock via fingerprint. But 
once the fingerprint authentication times out, light locker waits for a 
password to be typed, and the user cannot re-initiate fingerprint 
authentication. The usual way of pressing ESC does not have effect. There even 
is a state, where light locker does not accept fingerprint nor password 
authentication -- the user is left without any possibility to unlock the 
screen. This is not acceptable.
Please correct light locker's behavior with respect to libpam-fprintd 
authentication.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: light-locker (not installed)
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Apr 19 23:21:11 2014
EcryptfsInUse: Yes
InstallationDate: Installed on 2012-12-20 (484 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
SourcePackage: light-locker
UpgradeStatus: Upgraded to trusty on 2014-04-18 (1 days ago)

** Affects: light-locker (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty

** Description changed:

  With fprintd/libpam_fprintd installed, the user can in all places 
authenticate via the fingerprint reader. (Command line, login screen, light 
locker screen). However, light locker does not interact well with fingerprint 
authentication:
- Immediately after locking the session, the user can unlock via fingerprint. 
But once the fingerprint authentication times out, light locker waits for a 
password to be typed, and the user cannot re-initiate fingerprint 
authentication. The usual way of pressing ESC does not have effect. There are 
is a state, where light locker does not accept fingerprint nor password 
authentication -- the user is left without any possibility to unlock the 
screen. This is not acceptable.
+ Immediately after locking the session, the user can unlock via fingerprint. 
But once the fingerprint authentication times out, light locker waits for a 
password to be typed, and the user cannot re-initiate fingerprint 
authentication. The usual way of pressing ESC does not have effect. There even 
is a state, where light locker does not accept fingerprint nor password 
authentication -- the user is left without any possibility to unlock the 
screen. This is not acceptable.
  Please correct light locker's behavior with respect to libpam-fprintd 
authentication.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: light-locker (not installed)
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sat Apr 19 23:21:11 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2012-12-20 (484 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  SourcePackage: light-locker
  UpgradeStatus: Upgraded to trusty on 2014-04-18 (1 days ago)

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https://bugs.launchpad.net/bugs/1310104

Title:
  Light locker interacts badly with fingerprint authentication

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