Problem appears to be with amd64: nv (unstable) dumps core. So using (II) Module nv: vendor="X.Org Foundation" compiled for 1.6.2.901, module version = 2.1.14 On i686, successfully using unstable version (II) Module nv: vendor="X.Org Foundation" compiled for 1.7.3.902, module version = 2.1.15 Alan