I think I found a sollution 4 the flickering at my laptop. Haven't seen the flicker 4 about 2 hours now.
Do the following in the XFreeConfig-4, otherwise it will still flicker!
Option "HWCursor" = "0"
Option "SWCursor" = "1"
Option "NvAGP" = "1" (if X11 won't start try 2,3 or 0)
And also check the refreshrate KDE hast set 4 your display! It must be at 59 / 60 Hz not above for a TFT display! Make sure you check the box, that will save the settings into the XFreeConfig-4 file. After a reboot my flicker problem was gone.
I'm using Mandrake 10.1 (Cooker) at Uniwill 755IN Series. (Geforce FX 5600go 64MB)
I hope this will help some people too,