Please describe the problem:
screensaver can not use thinkfinger.

Steps to reproduce:
1. Install tinkfinger for T41 or some other Laptops with finger scanner.
2. Edit /etc/pam.d/system-auth, add new line before pam_unix.so (It's for Fedora system, other system maybe need modify other file.)
auth        required      pam_env.so
+ auth        sufficient    pam_thinkfinger.so
auth        sufficient    pam_unix.so nullok try_first_pass
3. /usr/sbin/tf-tool --add-user username
3.1 swipe your finger three times to let tf-tool get you fingerprint.
4. start screensaver, and goto the unlock-dialog.
5. you can only use password to unlock screen, you can not use fingerprint to unlock the screen.


Actual results:
Like login, su, sudo, gdm, they will show a prompt test "password or wipe finger", and user can use fingerprint to login system.

Expected results:
you can only use password to unlock screen, you can not use fingerprint to unlock the screen.

Does this happen every time?
yes.

Other information: