agp not working in 4x on asus intel815 tusl2-c

[Milan 0]

I have asus intel815 tusl2-c with tualatin, 512 sdram, GeForce4 mx440 and a problem with agp not working in 4x (bios is set to 4x, but in drivers section it is 2x) . My friend has a same motherboard with nvidia tnt 32mb, but his agp 4x is working.

[adamvjackson 0]

Do you have the latest i815 chipset drivers installed? How about BIOS revision?