GDM lock screen will not accept credentials and then loses keyboard?

[Graham Wheeler]

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

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command only once, as it will automatically gather debugging information, in a terminal:
apport-collect 1792843

When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.

[Graham Wheeler (t-gram)]

apport information

[Graham Wheeler (t-gram)]

apport information

[Graham Wheeler (t-gram)]

apport information

[Graham Wheeler (t-gram)]

Note: for now I have worked around this by preventing my console from being locked when the display sleep kicks in. Not ideal but at least I don't have to reboot after every sleep.

Also, probably not relevant, but this was happening before I switched to bionic app sources (which I needed for some php apps).

[Kain (kain-kain)]

This also happens to me on bionic on a dell xps 9370 (intel video)

[Kain (kain-kain)]

I can work around by using ctrl-alt-f1 to change to the user switcher and re-authenticatie into the session that way.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[nomike (michael-postmann)]

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