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[Murz <1310104@xxxxxxxxxxxxxxxxxx>]

Confirm, and same problem on Ubuntu 14.10 RC too.

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

Title:
  No way to trigger fingerprint authentication on lock screen

Status in “lightdm” package in Ubuntu:
  Confirmed

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 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)

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