Re: Support for X.Org Server 1.5
(II) Loading sub module "wfb"
(II) LoadModule: "wfb"
(II) Loading /usr/local/lib/xorg/modules//libwfb.so
dlopen: /usr/local/lib/xorg/modules//libwfb.so: Undefined symbol "miZeroLineScreenIndex"
(EE) Failed to load /usr/local/lib/xorg/modules//libwfb.so
(II) UnloadModule: "wfb"
(EE) Failed to load module "wfb" (loader failed, 7)
The above suggests that X.Org's libwfb.so was replaced with the one shipped with the NVIDIA graphics driver; restoring X.Org's binary should resolve this problem.