For me the same problem:
intel 950, compiz fusion from shame repos, debian lenny, xps m1210 , gnome 2.20 Crash randomly, on logout with few white blinking blocks.
For me the same problem:
intel 950, compiz fusion from shame repos, debian lenny, xps m1210 , gnome 2.20
Crash randomly, on logout with few white blinking blocks.