And finally, IMHO, the best: Updated (full) gdm

gdm (text/plain), 340 bytes, created by Pierre Poissinger on 2008-03-18 21:30:02 UTC

#%PAM-1.0
auth       optional		pam_env.so
auth       include		system-auth
auth       required		pam_nologin.so
auth	   optional		pam_gnome_keyring.so
account    include		system-auth
password   include		system-auth
password   optional		pam_gnome_keyring.so
session    include		system-auth
session	   optional		pam_gnome_keyring.so auto_start