Not sure if I have the same issue, but if I let my system go to sleep/suspend at the login screen, when I resume I cannot click in the password prompt and thus cannot type my password to login. For some reason the mouse will not give the password prompt text box focus.
It will give the password prompt text box focus if I first select another option from the user drop down list such as "Other..." or any other user, and then select my user again. Suddenly I can enter my password. Maybe this workaround might work for you as well. Like I said, your issue may be different. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to lightdm in Ubuntu. https://bugs.launchpad.net/bugs/1743423 Title: frozen login window' unable to login; must reboot' cursor moves no mouse clicks Status in lightdm package in Ubuntu: New Bug description: Denial o9f Service caused by holding a key that repeats for a long time. eg. cat takes nap on keyboard, cloting piled on keyboard Before submitting bug report I checked online and saw many other reports goin back about 15 months. I saw no mention of updates or how to reproduce. In my case the cursor continues to move around, but unable to use cursor to reboot. I can only use power off as none of they keys are working. Good thing the power button results are acceptable. and most applications fully recover. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: lightdm 1.18.3-0ubuntu1.1 ProcVersionSignature: Ubuntu 4.4.0-109.132-generic 4.4.98 Uname: Linux 4.4.0-109-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.15 Architecture: amd64 Date: Sun Jan 14 19:20:22 2018 InstallationDate: Installed on 2016-02-22 (692 days ago) InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805) ProcEnviron: LANGUAGE=en_US TERM=xterm-256color PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: lightdm UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1743423/+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