I have almost the same issue. Using gdm3, when I lock my session (e.g. with <super>+<L>) the lock screen doesn't accept keyboard and mouse events at all.
This all began right after the upgrade from bionic to cosmic. Another thing which might be related as it only happens when I use gdm3: When I open the activities view, it never goes away. This means: I see the launcher on the left, my desktop wallpaper overlayed with transparent black (for this dimm-effect) and this stays for ever. I can search for application, run programs either from the launcher or by searching for them or e.g. by pressing registered key combinations. The program-icons apear in the launcher as they should, but I don't see any actual program images as it appears they are all hidden beneath the activities background. When using sddm or lightdm I don't have this issues (though I have others). Software: Ubuntu cosmic amd64 with latest updates. X-Session: Gnome on Xorg Hardware: Lenovo Thinkpad x230 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1792843 Title: GDM lock screen will not accept credentials and then loses keyboard? Status in gnome-shell package in Ubuntu: Confirmed Bug description: So yesterday I got the prompt to upgrade my 16LTS system to 18. This caused a number of issues, but the most frustrating issue out of many has to be this one. After a period of inactivity, the lock screen kicks in. When I then try to log in, using the correct password, I get a spinner for about 10 seconds, the "Authentication error". After a couple of seconds "Authentication error" goes away but now it seems no keys are registering at all in the password field. I say "it seems" because I see no "*"s as I type, but I do see occasional prompts of "Authentication error" coming back, but I haven't pinpointed the circumstances - certainly not triggered by hitting ENTER, sometimes backspace? Not sure if it has anything to do with the keys. After this all I can do is log in over ssh and reboot; I'm basically locked out on the console. If I wait a while the keyboard does seem to come back but the problem is still there - my password is not accepted and then the keyboard again seems to do nothing for a while. This happens whether I have a USB keyboard connected or whether I am running Synergy and using a virtual keyboard. Mouse continues to work fine. Release and kernel: Ubuntu 18.04.1 LTS (GNU/Linux 4.15.0-34-generic x86_64) --- ProblemType: Bug ApportVersion: 2.20.9-0ubuntu7.3 Architecture: amd64 CurrentDesktop: ubuntu:GNOME DisplayManager: gdm3 DistroRelease: Ubuntu 18.04 GsettingsChanges: b'org.gnome.shell' b'favorite-apps' redacted by apport b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'" NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia Package: gnome-shell 3.28.3-0ubuntu0.18.04.2 PackageArchitecture: amd64 ProcVersionSignature: Ubuntu 4.15.0-34.37-generic 4.15.18 Tags: third-party-packages bionic Uname: Linux 4.15.0-34-generic x86_64 UpgradeStatus: Upgraded to bionic on 2018-09-16 (0 days ago) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1792843/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
