I am also seeing similar/the same behaviour on a Dell Latitude D820 using the built in Intel Graphics. It is hard to tell exactly what causes it and to reproduce. It seems more likely to happen when running a java based GUI application (Oracle's SQL Developer) and seems to be coupled with less severe GUI crashes where the window manager crashes, I see the console for a few moments before gdm kicks off again. Session is lost and I have to log in again.
Using the unity interface is virtually unusable (frequent crashes) using previous "classic" interface, seems to help but is extremely frustrating to use.
I am also seeing similar/the same behaviour on a Dell Latitude D820 using the built in Intel Graphics. It is hard to tell exactly what causes it and to reproduce. It seems more likely to happen when running a java based GUI application (Oracle's SQL Developer) and seems to be coupled with less severe GUI crashes where the window manager crashes, I see the console for a few moments before gdm kicks off again. Session is lost and I have to log in again.
Using the unity interface is virtually unusable (frequent crashes) using previous "classic" interface, seems to help but is extremely frustrating to use.
Never a problem under 10.04.