First of all let me say thank you for building a fingerprint authentication stack that works on free OSes! It's much appeciated :)
I've been using fprintd for a year or two now, and it strikes me that there are some ways in which its usability could be greatly improved. Perhaps this has already been discussed, though I can't see anything in a quick scan of the archives. Two big things that could be better: 1. Authentication with fprintd shouldn't be modal (either password or fingerprint). It's really inconvenient when you want to auth by means A and the software expects means B. The user should be able to authenticate by either method , as they wish, and software shouldn't demand one or the other at any given moment. 2. Fingerprint authentication shouldn't time out. It often takes a while, especially for newer users, to realise that they're being prompted for a fingerprint, and they'll often go to swipe right as the timeout is kicking in. If you solve 1, there isn't any reason for a timeout anyway. I don't know if PAM creates obstacles to fixing these...
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