Comment 6 for bug 127173

Confirmed on my both desktops AND my laptop, all running Kubuntu Gutsy. After hibernation/suspend-to-disk, the screen regularly goes blank after about ~5 minutes without user input. The screen just blanks, without the monitor going on standby. A mouse move unblanks the screen. Disabling/tweaking any powersaving related options in system-settings doesn't change the situation.

The three machines run completely different hardware, including the graphics cards, so I don't think it is a driver related problem.