ATI chipset support

modulename: ati-agp.ko

configname: CONFIG_AGP_ATI

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>/dev/agpgart (AGP Support)
└─>ATI chipset support
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This option gives you AGP support for the GLX component of
X on the ATI RadeonIGP family of chipsets.

source code:
drivers/char/agp/ati-agp.c