[fprint] Some glitchy-ness with AES2810

[Nathaniel Roach]

Hi all!

Not sure if it's debian's build, or my AES2810, but sometimes instead of 
working flawlessly like usual, the following happens:

Swipe your finger across the fingerprint reader
Swipe your finger again
Swipe your finger again

Despite using the right finger, and the finger and sensor being clean etc.
Or,

Swipe your finger across the fingerprint reader


Is repeated after each swipe without the "swipe again" message.

This would be fine, but my main issue is that fprint doesn't respect 
CTRL+C, so I'm left waiting for the timeout to occur. I'm not sure if 
the above issues are causing similar issues in lightdm too, but this'll 
mean I need to wait ~20seconds to login/unlock using a password, and 
even then it'll usually fail the first time.

Is there a way to enable CTRL+C support for sudo usage, and how would I 
aid in debugging the other issues?

Thanks,
Nathaniel Roach