Fingerprint reader doesn't work after suspend

[Forlong]

My fingerprint reader does not work after "waking up" my laptop.
This happens on both fingeprint GUI as well as fprint.
There is a workaround for fprint, fingeprint GUI crashed everytime. Had to uninstall.

Steps to reproduce when using fprint:
- go into suspend mode
- resume
- lightdm greeter says "swipe your finger…"
- nothing happens when swiping

- Wait until time out -

- lightdm asks for password
- press enter (without entering any password)
- lightdm says again "swipe your finger…"
- now it works

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: lightdm 1.12.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.16.0-30.40-generic 3.16.7-ckt3
Uname: Linux 3.16.0-30-generic x86_64
ApportVersion: 2.14.7-0ubuntu8.1
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Feb 7 23:54:05 2015
InstallationDate: Installed on 2015-02-03 (4 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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

[magix (mw99)]

I'm having the same issue. Would love to see a solution.

[vkapas (vkapas)]

I can confirm bug in Ubuntu 16.04 on Lenovo T420.
Also fingeprint works after click Switch user on lock screen.