Re: Annoying black flash and flickering screen Geforce Go 7300 in lenovo n200 laptop
When I upgrade from Ubuntu 8.04 to 8.10 I started getting a black flash and occasional checked board pattern when I was playing back a video in fullscreen.
I have traced it down to using the PPA for Compiz-Fusion. I un-installed Compiz-fusion packages, removed source list reference to the PPA for Compiz-fusion then reinstalled the regular Ubuntu 8.10 Compiz-fusion packages. This corrected both the black flickering and occasional checkerboard pattern.
Try turning off Compiz-fusion to at least determine if your issues involve Compiz-fusion. Note that my problems only involved playing back fullscreen video but not regular windows display.