Comment # 3 on bug 1203099 from Alynx Zhou

OK, I finally found the reason, it seems that we don't package the
gdm-fingerprint pam config.

I checked `/usr/lib/pam.d/`, there is no gdm-fingerprint file, so when gdm call
pam to do fprint check, it always fails.

I manually copied gdm-fingerprint file from my arch linux installation, and
fingerprint sensor just works on login and unlock.

According to line 20 and line 376 of
https://build.opensuse.org/package/view_file/GNOME:Factory/gdm/gdm.spec?expand=1,
it seems that we don't install gdm-fingerprint files at all, and in line 296 it
says that we don't know what to put in gdm-fingerprint (also about line 295: my
system does not remove gdm-password). So I checked
https://build.opensuse.org/package/view_file/GNOME:Factory/gdm/gdm-fingerprint.pamd?expand=1,
it contains nothing about pam_fprintd.so, so even we install it, it won't work.

Some distros uploaded their pam files to
https://gitlab.gnome.org/GNOME/gdm/-/tree/main/data (like Arch and Red Hat),
they are quite different, we may need create our own to fix this bug?