I notice that if I use the mouse to deactivate the screen saver, I do still see the screen shield, so that appears to be working normally. When the shield lifts, I get the "login screen without login widget" described above.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1812373 Title: Desktop is not restored correctly after screen saver Status in gnome-shell package in Ubuntu: New Bug description: With the update to 3.28.3-0ubuntu0.18.04.4, on two separate machines, the screen saver stopped working properly. When the screen is locked manually (by clicking the lock screen icon), the screen either freezes with the desktop still showing, or shows the same grey background as the login screen; it does not show the normal lock screen image. When the screen saver is activated automatically, the screen turns off as normal, but when I press a key, the grey background as for the login screen is shown (in fact, it's the same as the login screen, but without the login widget; that is, the normal icons are shown at the top of the screen). Pressing Ctrl+Alt+F1 switches to the login dialog. I can then log in successfully, but all GNOME shell extensions are disabled. (A simple workaround is then to restart gnome-shell with the "r" command from the "Enter a command" dialog.) I am marking this bug as a security vulnerability because in the case that the screen simply freezes, confidential information may be displayed by the failure of the screen shield to activate. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: gnome-shell 3.28.3-0ubuntu0.18.04.4 ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18 Uname: Linux 4.15.0-43-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.5 Architecture: amd64 CurrentDesktop: GNOME Date: Fri Jan 18 10:28:59 2019 DisplayManager: gdm3 InstallationDate: Installed on 2014-11-26 (1514 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) SourcePackage: gnome-shell UpgradeStatus: Upgraded to bionic on 2018-08-16 (155 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1812373/+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
