I finally found something that worked with my fingerprint scanner, only to learn that the scan can't unlock the keyring or something -- it's a password but not actually a password. So I'd unlock the desktop with the fingerprint scanner, and then an indeterminate number of seconds later something would pop up asking me to type a password for my keyring.

So now, instead, I just type my password to begin with, and it's all gravy. I'd have to type it anyway.