pacman -S fprintd
https://wiki.archlinux.org/index.php/Fprint
/etc/pam.d/sudo
auth sufficient pam_fprintd.so
/etc/pam.d/gdm-fingerprint
auth required pam_tally.so onerr=succeed file=/var/log/faillog auth required pam_shells.so auth requisite pam_nologin.so auth required pam_env.so auth required pam_fprintd.so auth optional pam_permit.so account include system-local-login password required pam_fprintd.so password optional pam_permit.so session optional pam_keyinit.so force revoke session include system-local-login
/etc/pam.d/system-local-login
auth sufficient pam_fprintd.so