https://bugs.kde.org/show_bug.cgi?id=521469

--- Comment #3 from [email protected] ---
A huge (and maybe relevant) note: this is regular ubuntu, not kubuntu. I
installed Plasma alongside gnome to test if I would like it better.
Hardware is Goodix MOC Fingerprint Sensor (press), enrolled right-index-finger
Laptop: framework 13 

The fingerprint PAM service the locker uses does exist and is the stock one.
It's shipped by libkscreenlocker6 at /usr/lib/pam.d/kde-fingerprint. It's
derived from gdm-fingerprint and includes fprintd directly:

  #%PAM-1.0
  # Taken from gdm3's gdm-fingerprint
  auth    requisite       pam_nologin.so
  auth  required        pam_succeed_if.so user != root quiet_success
  auth  required        pam_fprintd.so
  auth    optional        pam_kwallet5.so
  @include common-account
  ...

I tested the PAM side independently with pamtester against that exact service,
with no greeter involved:

  $ pamtester -v kde-fingerprint "$USER" authenticate
  pamtester: invoking pam_start(kde-fingerprint, drongo, ...) << drongo is the
user name
  pamtester: performing operation - authenticate
  Password: Place your finger on the fingerprint reader
  pamtester: successfully authenticated

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