Comment # 5 on bug 1207788 from Martin Wilck

(In reply to Alynx Zhou from comment #1)
> Hi, I see you are using Leap, could you please try to install another
> tumbleweed and see whether this still happens? We don't have a correct PAM
> config for fingerprint login until recently I added one to tumbleweed. If
> tumbleweed works for you, I could also add it to Leap.

That's not so easy, as this is my primary workstation. At least it will take
time. Would it be possible to just pull in some fixed package(s) on Leap?

> Also, is this only happens recently, or always on this device? I think gdm
> fingerprint login never works on Leap.

As I said, this is a new phenomenon. gdm fingerprint did work for me, on both
Leap 15.3 and 15.4, on this system. I basically just installed and enabled
fprintd, enrolled my fingerprint, and ran "pam-config -a --fprintd".

The fingerprint detection itself is much less reliable as I am used to e.g.
from Android devices, but it's not unusable. I did observe some strange effects
in the past:

 1. The fact that the password prompt is displayed makes you think that you
could use either method for logging in, but it seems that (sometimes at least)
password login only becomes possible after a certain number (3?) of fprint
detection failures
 2. sometimes, if fingerprint detection fails a few times in a row, the display
gets slightly garbled, but it's normally possible to log in with password

These were annoying, but by far not as destructive as the bug reported here.