fprintd is a daemon that provides fingerprint scanning functionality
over D-Bus.
This is the software developers will want to integrate with to add
fingerprint authentication to OSes, desktop environments and
applications.
It also includes small command-line utilities if your desktop
environment does not integrate support.
A PAM module to implement user login (pam_fprintd) is available.
To enable it add these lines on top of /etc/pam.d/sddm:
auth sufficient pam_unix.so try_first_pass likeauth nullok
auth sufficient pam_fprintd.so
And /etc/pam.d/kde:
auth sufficient pam_unix.so try_first_pass likeauth nullok
auth sufficient pam_fprintd.so
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