There is lot of pages stating that the Thinkpad T440p fingerprint sensor is not working well under Linux, but those are old and outdated. For me it worked out of the box once I figured out which packets to install:
apt-get install libfprint fprintd libfprintd
fprint-demo can also be installed to play with the sensor.
Then to enable login with the sensor in Gnome3, navigate to
- Enroll you finger.
Tested under Debian Buster (testing), figerprint sensor model is