It seems that the problem has two parts. The first is wrong owner of
/dev/input/uinput: it should be root:plugdev instead of root:root

The second part of the problem can be seen after manually changing the owner:
     sudo chown root\:plugdev /dev/input/uinput

Now after locking the screen you should see 'Password or swipe finger: '
prompt in the unlock dialog but unlocking doesn't work. Swiping finger
has no effect and after entering password the dialog hangs saying
'Checking...'. I didn't wait to see if it ever finishes and killed the
gnome-screensaver process from console (login didn't offer to swipe
finger, only password).

I tried reproduce the above with 'gnome-screensaver --debug --no-daemon
&> gs.out' and attached the output. Also, I noticed that this is not
always reproducible. Sometimes swiping works in the unlock dialog and it
hangs only after n-th attempt to lock/unlock the screen.

** Attachment added: "gnome-screensaver --debug --no-daemon &> gs.out"
   http://launchpadlibrarian.net/19611413/gs.out

-- 
(gutsy) lock screen doesn't support fingerprint readers driven by thinkfinger
https://bugs.launchpad.net/bugs/138957
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