If gnome-screensaver isn't root during authentication, then how does an
ordinary password work?  They are stored in a root readable file
/etc/shadow.  Whatever credential switching that is done in order for
ordinary passwords to work could also be done for thinkfinger to work.

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(gutsy) lock screen doesn't support fingerprint readers driven by thinkfinger
https://bugs.launchpad.net/bugs/138957
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Desktop Bugs, which is a bug contact for gnome-screensaver in ubuntu.

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