Lenovo T440s Fingerprint reader in Fedora 20

After all, I fixed the problem at least partially. Apparently,

yum install fprintd-pam

did the trick. Now, I can use the fingerprint reader for sudo authentication and removing a screen lock but not yet for the initial login screen (which I think is quite weird, since the login screen and the screen lock prompt look pretty much the same). Any further answer on how to achieve this is still welcome.