Please describe the problem:
gnome-screensaver claims that it supports PAM authentication, but it appears that PAM support is incomplete, because I cannot use the fingerprint scanner on my laptop (which works through a PAM module) to authenticate.  Authentication by fingerprints works for GDM, sudo, su, login and most other PAM applications.

Steps to reproduce:
1. Lock screen.
2. Try to unlock screen.


Actual results:
The password dialog does not indicate an option to swipe a finger instead of entering a password, nor does swiping a finger work.

Expected results:
Swiping a finger should unlock the screen.

Does this happen every time?
Yes.

Other information:
The problem was reported on the thinkfinger mailinglist (thinkfinger is the fingerprint software and PAM module) here: 
http://article.gmane.org/gmane.linux.drivers.thinkfinger/92

The message seems to indicate that someone is working on this, but I thought this should be recorded on the issue tracker to make sure that it does not get lost.