A clarification: several seconds after unlocking the session, the screen blacks out until a key is pressed (rather than for just a couple of seconds, as inititally reported). That is, it seems a screensaver is being reinitiated, although it doesn't require another authentication in order to exit from it.
** Summary changed: - several seconds after logging in from screen lock, screen goes black for 2 seconds + several seconds after logging in from screen lock, screensaver reactivates -- 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/1303899 Title: several seconds after logging in from screen lock, screensaver reactivates Status in “lightdm” package in Ubuntu: New Bug description: About 10 seconds after I unlock my screen following a screen lock, and after everything seems fine for some seconds and I have normal operation, the screen blacks out for a couple of seconds. This is a software, not hardware issue, but I'm only guessing at the right package. I have up-to-date 14.04. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: lightdm 1.9.14-0ubuntu2 Uname: Linux 3.14.0-031400-generic x86_64 ApportVersion: 2.14.1-0ubuntu1 Architecture: amd64 CurrentDesktop: Unity Date: Mon Apr 7 11:51:38 2014 EcryptfsInUse: Yes InstallationDate: Installed on 2014-03-11 (27 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140218) 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/1303899/+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