On my laptop when I close the screen or after I have been away for some amount of time the screen will either go blank/black or the screen will be so fuzzy and jumbled its unusable.

Restarting X (ctrl+alt+backspace) does get me back to the login screen and the problem is seemingly gone until it idles.

I have set all of the settings for power management and gnome/kde's idle screen to never turn off which helps but inevitably I will return to the computer with the same problem. I have seen this problem with opensuse 10.2 & 11 (beta 3) and ubuntu 7.10 & 8.04 but only on my laptop. I am thinking it must be the Nvidia driver since the problem spans across distros and kernels. Any thoughts?