I installed Linux Mint 13 Cinnamon on my ThinkPad T520 last night and was tempted to get the fingerprint scanner working... the whole process was almost completely painless and very cool!
USB device details:
147e:2016 Upek Biometric Touchchip/Touchstrip Fingerprint Sensor
sudo apt-get install fprint-demo libfprint-dev libfprint0 libpam-fprint aes2501-wy
fprint_demo is a GUI application to enroll different fingers etc for your system and worked a charm, there is a console alternative although I didn't give it a try called: pam_fprint_enroll
Next you need to edit: /etc/pam.d/common-auth
Add the following line:
auth sufficient pam_fprint.so
Note that if you add it say 3 times you can try logging in with your fingerprint 3 times before PAM moves onto asking you for a password. You can also change sufficient to required if you would like fingerprint + password auth.