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If you encounter a bug, proceed to https://bugs.kde.org/, check whether it has been reported.
If it hasn't, report it yourself.
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Developers do not look for reports on social media, so they will not see it and all it does is clutter up the feed.
Does it prompt for fingerprint if you enter an empty password? If not, I have done a little looking around and found a source that states the following :
Add the following two lines to /etc/pam.d/kde :
auth sufficient pam_unix.so try_first_pass likeauth nullok
auth sufficient pam_fprintd.so
This configuration allows you to first press enter on the empty password field to be prompted for the fingerprint
Empty password doesn't prompt for a fingerprint, and I thought that was the old hacky workaround for Plasma 5 that Plasma 6 was supposed to have fixed?
Even if it is, I'm unable to find any other solution. It's at least worth a shot.
Do be sure to report this bug in the meantime, it's likely related to pam &/or SDDM.
Will do if I can establish what the expected behaviour is supposed to be - from the one line on the website I'd expect a "login with fingerprint" button or something, but I might be wrong - so I know what I'm seeing is actually a bug and not me misinterpreting
Will see if I can track down the original PRs or something, see if there is screenshots or a proposed UI design
So before: either enter password, or use fingerprint.
There was a bug where fingerprint always worked for me but password often didnt until I used it, quite bad.
Now this sounds as if you could enable "require password AND fingerprint" (both)