Weird Video Problems

Hi Again, Just when I thought I had all my video problems fixed, another shows up. Some background. I have a compaq presario R3000 amd 64 laptop. I have successfully configured the nvidia drivers from SuSE and you for 1280x800. The weirdness occurs after screensaver (blank setting) wakes up. If the backlight of the screen is turned off by the screensaver then the video returns garbled. If I log out then back in again the video is proper. This behaviour has me completely stumped. Please, has anyone any ideas? Thanks in advance, Phil