Note : this behaviour usually starts to occur after a couple of days uptime (this is on a Dell XPS7390 2-in-1 with unrecognized fingerprint reader), for every action which requires authentication (su, sudo, virt-manager, screensaver unlocking).
journalctl error message (for the "su" example from comment#20) :
Aug 22 10:50:12 mymachine su[2571952]: pam_fprintd(su:auth): GetDevices failed: Connection timed out
Note : this behaviour usually starts to occur after a couple of days uptime (this is on a Dell XPS7390 2-in-1 with unrecognized fingerprint reader), for every action which requires authentication (su, sudo, virt-manager, screensaver unlocking).
journalctl error message (for the "su" example from comment#20) :
Aug 22 10:50:12 mymachine su[2571952]: pam_fprintd( su:auth) : GetDevices failed: Connection timed out