Comment 70 for bug 216697

kdesu is bad. I suggest using KdeSudo, which uses sudo and works well with fprint:
http://www.kde-apps.org/content/show.php/KdeSudo?content=72106 Because it uses sudo, you can configure your /etc/sudoers :
"KDE's normal KdeSu doesn't deal correctly with sudo, and is only capable of authentication. It doesn't deal with sudo specific features like NOPASSWD and so on."

"Other kde apps" should work IF they work with pam...

As somebody said here, PAM takes care of authentification. thinkfinger wasnt stable, so it did not worked well with KDE. But fprint is more stable, so it does not crash KDM (or anything else). KDM does not have to support fingerprint auth., it just need to support PAM (which it does). It must be stable enough not to crash though.

As #61, there is too much "enter" to press. But this is an issue with PAM and its interaction with programs. It does work.

What could be done in KDM is maybe a better integration with fingerprint readers. For example, a message telling to press enter _without_ a password to authenticate with fingerprint...