I'm using a motherboard with the VIA KT133 chipset. According to http://www.via.com.tw/en/apollo/kt133.jsp
, it supports 4x/2x AGP. However, the output of /proc/driver/nvidia/agp/host-bridge is:
Host Bridge: VIA Technologies, Inc. VT8363/8365 [KT133/KM133]
Fast Writes: Not Supported
AGP Rates: 2x 1x
This is the same with agpart and nvagp. I have tried to change the os-registry.c file to allow 4x on VIA chipsets, without success. I have also tried setting the AGPreq thing, unsuccessfully. Does anyone know what the problem might be?