I have an nVidia (Riva TNT2) video card which I'm trying to use on a dual-head machine. The problem seems to be that my second display card is not an nVidia, and so nVidia's proprietary GLX gets confused and causes a signal 11.

My question is this: Under XFree 4.X.X, does anyone know a way to disable an extension on a single card? As it is I have disabled GLX completely, which sucks ass because I have no hardware acceleration for playing DVD's and DIVX's.