Fingerprint detection issue in GUI

General system Kernel, boot, graphics & hardware
1

I recently got a Dell 7630 with a fingerprint reader. And tried enabling the fingerprint detection in Endeavour.
I was able to follow the fingerprint-gui page in the arch wiki and this forum post to get fingerprint working in the TUI, and lightdm detecting it (but not recognizing) in the lock screen.

  • fingerprint-gui did not detect my sensor, but i was able to register with fprintd-verify
  • I am able to login in the TUI using my finger, but no such luck in lightdm
2

Did you add the line to your PAM config for LightDM?

...
auth    sufficient    pam_fingerprint-gui.so
...

Here is the relevant part of the wiki: https://wiki.archlinux.org/title/Fingerprint_GUI#Authentication

3

Yes, I have. Since then Ive also tried SDDM enabling via Arch Wiki, where its able to sense my fingerprint, but not authenticate it

4

Can you explain what you mean by that? It sounds like the fingerprint is failing validation, is that right?

I set up a fingerprint reader on an Arch box not too long ago using fprintd. It was really simple and works very well. If you can’t get fingerprint-gui working I would say give it a shot because it was very easy to set up: https://wiki.archlinux.org/title/Fprint

5

So far everything for fingerprint is successful, except logging in. Ive tried LightDM and SDDM, both of which refuse to either acknowledge i have a finger, or that i have a sensor whever they please.
Though I have added the following to get it working everywhere except login managers:

auth		sufficient  	pam_unix.so try_first_pass likeauth nullok
auth		sufficient  	pam_fprintd.so
6

It does seem to work if i add those lines to the lightDM. But im not sure if that is the right approach

7

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