Garbled screen after monitor off.

[observer24]

Hello, I'm running Mandrake 10. with the 2.6.8.1-5mdksmp kernel. I installed the latest drivers from nvidia, and mostly everything runs smoothly. The only problem I am encountering is when I leave the computer for a while (long enough for the screensaver to turn on and the monitor to turn off... ~15 minutes), when I move the mouse and the screen turns back on, it has nothing but garbled, seemingly random noise. When I move the mouse, I can see a distinct and clear cursor, but nothing responds to clicking input.

I can alt-ctrl-F1 out, then init 3 and restart the the xserver (startx), and then everything runs fine.

Any help with this problem would be greatly appreciated.

Thanks.