Comment 1 for bug 1165852

I have a similar problem. I use Unity, not KDE. I have no trouble fingerprint-authenticating for sudo.
But nearly (but not quite) 100% of the time when my laptop (Thinkpad X230T) wakes from sleep, it will not give me the option to swipe or type for up to a minute after waking. Instead, it seems to be waiting for a fingerprint, but then gives up, claiming "authentication timed out", and then it sits locked up with that message for a minute, before reverting to the password entry option. At that point, I can press enter, whereupon for the first time, the fingerprint reader is activated and I can log in with it.