After resuming from suspend the fingerprint reader is not ready for input (the little green LED is off thinkpad x201t) even though the text to use the fprint reader is shown (swipe you right index finger across the fingerprint reader), but I can not log in.
If I wait until the authentication is switched to keyboard and I hit enter, the fingerprint reader text is shown again, the greed LED is on and I can log in using the fingerprint reader.
If I just lock the screen everything works as expected.
I am using fprintd (0.5.1-1) and Ubuntu 14.04.
It seems the problem is, that the fingerprint reader does not get turned on correctly after the suspend.