Well unity is just using PAM to check if the password is correct. You can try to reproduce the problem with gnome-screensaver. If it happens with g-s as well then it's not unity's fault.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to unity-greeter in Ubuntu. https://bugs.launchpad.net/bugs/1499354 Title: Invalid password after long uptime Status in Unity: Incomplete Status in unity package in Ubuntu: Incomplete Status in unity-greeter package in Ubuntu: Invalid Bug description: After a 15.04 system has been running for a long time (more than 2-3 days), and the system has locked the screen automatically during inactivity, attempting to unlock the screen will result in an "invalid password" message at the lock screen, despite using the correct password. The only fix I've found is to jump to a TTY, log in there (which works), and do a "sudo service lightdm restart". I've made no changes to my PAM configuration, nor do I have any packages installed which modify it. Only other thing I've noticed is that normally, my screens go to sleep after the display is locked. Every time this problem presents itself, the displays have awoken at some point overnight. No obvious errors in auth.log, xorg.log, or lightdm.log. Using the proprietary NVIDIA drivers. Unity Installed: 7.3.2+15.04.20150420-0ubuntu To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/1499354/+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
