Option "UseInternalAGPGART" "boolean"
Enable or disable the usage of an internal agpgart module. If you set this option to "yes", the driver will not use the kernel's AGPGart module. Instead it will make use of the "built-in" AGP support. The default is "no", as long as the graphics driver's kernel module detects the presence of an agpgart kernel module.
If you set this option to "yes" you must ensure, that you don't have the kernel AGP support compiled in. Instead compile it as modules.
for this as for the agp options you have to make sure how the kernel agp works.