suspected as much
I kinda suspected as much as agpgart has NEVER reported finding any AGP cards on bootup. under 2.4.x or under 2.6.0 testxx
It is a k8T800 and VT8237 chipset. this is fairly new stuff and as usual you buy the latest and greatest and have to wait till support becomes stable.
lately I have been concentrating on APIC which is prolly the root of the problem. I have seen some strange dmesg stuff about apic not setting up IRQ's or lines already configured etc. I have tried BIOS settings to try and force a mapping that agpgart/nvidia will like. No luck just yet.
This problem IMHO is probably more appropriate as a APIC kernel bug for this chipset.