I too was affected by this bug. I run a fully updated 16.04 installation (currently 16.04.2) of Ubuntu. I used nouveau. When I pressed the power button on my work desktop to wake it from suspend, *sometimes* (here I differ from the original reporter) the login screen would appear and freeze. The system would not completely lock up. I could use ctrl + alt + f2 to switch to TTY2 and then restart the computer, like the original reporter.
If I tried restarting lightdm via sudo service lightdm restart, the computer would completely lock up and I had to perform a hard restart. I successfully worked around the issue by installing the proprietary nvidia driver (nvidia-340). -- 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/1605813 Title: lock screen freezes while trying to wake from suspend Status in lightdm package in Ubuntu: Confirmed Bug description: Background: I am running a fully updated 16.04.1 installation of Ubuntu using open source nVidia drivers. When I press the power button on my PC to wake the computer from suspend, the login screen appears and freezes. The box around my username becomes somewhat opaque and no text box that would allow me to enter my password appears. I have tried this many times, and it always locks up in the same way. Steps taken after issue occurs: I have found, however, that the system is not completely locked up. I can use CTL + ALT + F2 to switch to TTY2. From there I can login and restart the computer without issue. I also tried restarting lightdm via sudo service lightdm restart. When I tried this and switched back to the GUI, the login screen was loaded, and I could type my password. Once the login screen disappeared, one of my monitors (dual-monitor setup) switched to my user account's wallpaper, and then the system locked up. I had to perform a hard restart. Workaround: I have found that using the proprietary 361.42 drivers provides a work around for this issue. When using the proprietary drivers, the computer resumes from suspend without issue. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: lightdm 1.18.2-0ubuntu1 ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13 Uname: Linux 4.4.0-31-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 CurrentDesktop: Unity Date: Fri Jul 22 20:53:10 2016 EcryptfsInUse: Yes InstallationDate: Installed on 2016-07-08 (14 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) ProcEnviron: LANGUAGE=en_US PATH=(custom, no user) XDG_RUNTIME_DIR=<set> 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/1605813/+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
