mannheim: As explained above by otzenpunk and J0rd, gnome-keyring has to
face a different problem than PAM. PAM can arbitrarily decide to allow a
user to log in, it is completely mastering this authorization process.
It is not the case of gnome-keyring, which stores the passwords in an
encrypted file on the disk. To decrypt you passwords, you need the
master password of the keyring, this is a technical/physical/absolute
requirement.

What would be needed is to replace the master password with something
you can get from fingerprints. But that's not easy, if even possible:
images are always different, and you would have to find a constant
feature of your fingerprint without being able to compare with precedent
images. Possibly a realm of investigation for future developments, but
certainly not a bug to fix!

So the only solution here can be to remove secure storage of your
passwords by setting an empty master password. Use at your own risk if
you lose your laptop! For now, I guess this bug must be closed.

-- 
Thinkfinger doesn't unlock keyring
https://bugs.launchpad.net/bugs/276384
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