I've experienced a similar problem with 10.04, 10.10 and 11.04. I can reproduce it by turning on the screensaver and closing the lid of my laptop. It doesn't happen all the time, but a lot of the time when I press a key or touch the trackpad to bring up the login screen, the display just remains blank.
I've experienced a similar problem with 10.04, 10.10 and 11.04. I can reproduce it by turning on the screensaver and closing the lid of my laptop. It doesn't happen all the time, but a lot of the time when I press a key or touch the trackpad to bring up the login screen, the display just remains blank.