Hi all,

I'm using Fedora 23, along with the cinnamon desktop. I set up the fingerprint reader which works fine.

When I lock the screen (Ctrl + Alt + L), and I try to unlock :

1. the form to enter my password displays, but I can't type, and it says "please swipe your finger". Swiping my finger does nothing. After waiting 10 seconds, it says "Verification timed out", and I can type my password and login.

2. If I click "Switch user", the screen goes black, and I can't do anything except hard-kill my machine by long-pressing the power button.

I tried to search online, but I'm too new to this ecosystem for this. Could you help me with :

1. What log should I check ? system log ? gnome log ? cinnamon log ?

2. Which program might be the cause of this ? does gnome have a special login program ? should I reinstall the graphic environment ?

Generally speaking, I don't know how to start tackling the problem.

Thanks a lot ! Jwhite

Edit 1

It looks like I'm already using GDM (and not lightDM). See the output of pstree :

     ├─gdm─┬─gdm-session-wor─┬─gdm-wayland-ses─┬─dbus-daemon───{dbus-daemon}
    │     │                 │                 ├─gnome-session-b─┬─gnome-settings-─┬─{dconf worker}
    │     │                 │                 │                 │                 ├─{gdbus}
    │     │                 │                 │                 │                 ├─{gmain}
    │     │                 │                 │                 │                 └─{pool}
    │     │                 │                 │                 ├─gnome-shell─┬─Xwayland─┬─{llvmpipe-0}
    │     │                 │                 │                 │             │          ├─{llvmpipe-1}
    │     │                 │                 │                 │             │          ├─{llvmpipe-2}
    │     │                 │                 │                 │             │          └─{llvmpipe-3}
    │     │                 │                 │                 │             ├─ibus-daemon─┬─ibus-dconf─┬─{dconf worker}
    │     │                 │                 │                 │             │             │            ├─{gdbus}
    │     │                 │                 │                 │             │             │            └─{gmain}
    │     │                 │                 │                 │             │             ├─ibus-engine-sim─┬─{gdbus}
    │     │                 │                 │                 │             │             │                 └─{gmain}
    │     │                 │                 │                 │             │             ├─{gdbus}
    │     │                 │                 │                 │             │             └─{gmain}
    │     │                 │                 │                 │             ├─{JS GC Helper}
    │     │                 │                 │                 │             ├─{JS Sour~ Thread}
    │     │                 │                 │                 │             ├─{dconf worker}
    │     │                 │                 │                 │             ├─{gdbus}
    │     │                 │                 │                 │             ├─{gmain}
    │     │                 │                 │                 │             └─{threaded-ml}
    │     │                 │                 │                 ├─{dconf worker}
    │     │                 │                 │                 ├─{gdbus}
    │     │                 │                 │                 └─{gmain}
    │     │                 │                 ├─{gdbus}
    │     │                 │                 └─{gmain}
    │     │                 ├─{gdbus}
    │     │                 └─{gmain}
    │     ├─gdm-session-wor─┬─gdm-x-session─┬─Xorg─┬─xf86-video-inte
    │     │                 │               │      └─{Xorg}
    │     │                 │               ├─cinnamon-sessio─┬─abrt-applet─┬─{gdbus}
    │     │                 │               │                 │             └─{gmain}
    │     │                 │               │                 ├─blueman-applet─┬─{dconf worker}
    │     │                 │               │                 │                ├─{gdbus}
    │     │                 │               │                 │                └─{gmain}
    │     │                 │               │                 ├─cinnamon-killer─┬─{dconf worker}
    │     │                 │               │                 │                 ├─{gdbus}
    │     │                 │               │                 │                 └─{gmain}