[SOLVED] disable agpgart support in kernel

[roadkillbunny]

I am trying to disable toe agpgart support in the kernel so I can use the one that commes with the binary nvidia drivers. The only problem I have is that I can't seem to do it. I located the option under Device Drivers -> Characters
Devices but there is no checkbx button beside "/dev/agpgart (AGP Support)" and it is not disabled because when I grepped though the .config I found:
CONFIG_AGP=y
CONFIG_AGP_AMD64=y
# CONFIG_AGP_INTEL is not set

I also tried to edit .config manually and then run xconfig, but that made no difference as it always ended up being Y. I tried commenting it out and setting it to m with no luck.

Is there something I need to do before I am able to disable it? This is suspend2-sources-2.6.15-r8 if that matters.

EDIT: I solved this by disabling IOMMU support. It can be found under Processor Type and Features.