https://bugs.kde.org/show_bug.cgi?id=499893

--- Comment #4 from chws...@outlook.com ---
Created attachment 178274
  --> https://bugs.kde.org/attachment.cgi?id=178274&action=edit
fprintd journal logs after polkit changes

I've done some digging and it seems like the fprintd errors are polkit related.
Based on this comment
(https://github.com/i3/i3lock/issues/210#issuecomment-1033042602) I created two
rules in this directory '/etc/polkit-1/rules.d/':

50-net.reactivated.fprint.device.claim.rules
and
50-net.reactivated.fprint.device.verify.rules

After creating these rules, I'm no longer getting the fprintd authorisation
denied messages in my journal logs. However the fingerprint authentication is
still failing to appear on the unlock screen after the machine goes to sleep.

I think that I've also made another breakthrough. I noticed that if I wake the
machine from sleep very quickly, the fingerprint authentication option is still
there. Under System Settings > Screen Locking I have the "Delay before password
required" option set to 30 seconds. If I wake the laptop from sleep before 30
seconds, the fingerprint option is there, but if I wake the laptop after longer
than 30 seconds the fingerprint option is no longer there.

I can replicate this behaviour with other time delays for the "Delay before
password required" setting. However setting this to "Never require a password"
simply means that the machine never locks and isn't suitable for anyone with
any security considerations.

So could this be an issue with my settings under pam.d? I'm a bit lost with
these settings and especially lost when it comes to how they interact with
kscreenlocker

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