Fingerprint scanner

Fingerprint scanners (on laptop computers) can be used to unlock devices instead of using passwords.

Install

# Start the driver at boot
systemd.services.fprintd = {
  wantedBy = [ "multi-user.target" ];
  serviceConfig.Type = "simple";
};

# Install the driver
services.fprintd.enable = true;
# If simply enabling fprintd is not enough, try enabling fprintd.tod...
services.fprintd.tod.enable = true;
# ...and use one of the next four drivers
services.fprintd.tod.driver = pkgs.libfprint-2-tod1-goodix; # Goodix driver module
# services.fprintd.tod.driver = pkgs.libfprint-2-tod1-elan # Elan(04f3:0c4b) driver
# services.fprintd.tod.driver = pkgs.libfprint-2-tod1-vfs0090; # driver for 2016 ThinkPads
# services.fprintd.tod.driver = pkgs.libfprint-2-tod1-goodix-550a # Goodix 550a driver (from Lenovo)

Enroll fingerprint

Just run

sudo fprintd-enroll

or use the UI in the Desktop Environment if available.