The same problem appears to me after upgrading to 16.04 with an Intel card (described below), both with sleep and deep sleep: when I wake the computer, I have a normal box in the centre of the screen, the rest is darker, and no login box...
My only turn around is to log on another TTY, and stop the session (kill -9 -1). Similar environment otherwise (16.04.01 up to date, amd64), except fr_FR and graphic card. `sudo lshw -C display` returns (in French) *-display description: VGA compatible controller produit: 3rd Gen Core processor Graphics Controller fabriquant: Intel Corporation identifiant matériel: 2 information bus: pci@0000:00:02.0 version: 09 bits: 64 bits horloge: 33MHz fonctionnalités: msi pm vga_controller bus_master cap_list rom configuration: driver=i915 latency=0 ressources: irq:29 mémoire:f6400000-f67fffff mémoire:e0000000-efffffff portE/S:f000(taille=64) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1605813 Title: lock screen freezes while trying to wake from suspend To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1605813/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs