I had the same problem in Kubuntu Edgy and now on Feisty. I have to press a key or move the mouse to get the password dialog. Whenever somebody else than me open my notebook (which wakes it up from suspend) they press the power button after a while because it looks like it is not powered on. Also, it would be nice if there was some on-screen indication that the machine is waking up, even before the password dialog shows up (which can take a dozen seconds).
-- On resume, screen is blank instead of prompting for password https://launchpad.net/bugs/14060 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs