Confirm, and same problem on Ubuntu 14.10 RC too.

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  No way to trigger fingerprint authentication on lock screen

Status in “lightdm” package in Ubuntu:

Bug description:
  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 
  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 

  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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