I recently upgraded my system to Fedora 34. For the record, my system is the XFCE spin variant. Since then I’ve been having issues with the login screen after the session gets locked out due to inactivity. When I try to log back in, the input field in the login screen won’t accept any input. There’s no issue with my keyboard since the screen itself detects whether the caps lock key was pressed, and typing has not been an issue.
I’ve been trying to research if someone else has been having the same problem since upgrading but it seems I’m alone in this.
After the last update, there seems to be some problems regarding wayland and at least certain nvidia cards.
You may try to switch to x11.
I strongly suggest to also apply the point “Changing the default GNOME session via configuration file”, since on the login screen you may encounter all kind of problems if the default still is wayland.
I see, I didn’t know that you use an xfce only spin.
Reasoning behind was, that if there’s a gnome desktop environment installed as well, it might be the default environment even if you don’t use it. The display server behind may have switched to wayland in the process of updating. That could eventually cause such problems on the login screen.
If xscreensaver locks before xfce4-screensaver and both are locked and you unlock xscreensaver but leave xfce4-xscreensaver locked and you wait for xscreensaver to lock again, password input is not accepted by xfce4-screensaver.