Closing...I've just noticed that this issue is caused by the backlight that is not restored when I move the mouse or press the keyboard, so I must restore the backlight using the keyboard button; so I'm opening another bug...
** Changed in: gnome-control-center (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/841109 Title: Cannot restore session after "locking screen" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/841109/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs