Hello, I hit this issue today after upgrading to gdm 45~beta-1 . Switching to "/etc/pam.d/gdm-smartcard-sssd-or-password" works, but breaks "face chooser" on the GDM login screen. Apparently the same happens also on Ubuntu. Please see: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1933027/comments/13 .
It would be great if either one could disable smart-card integration via update-alternatives (as suggested here: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1933027/comments/12) or if "gdm-smartcard-sssd-or-password" could provide the same login experience as of the previous behavior. Thank you Regards -- Marco