default or selected kernelversion does not have config value CONFIG_AGP_ATI.
Result is shown for kernelversion 6.0-rc7

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

This option gives you AGP support for the GLX component of
X on the ATI RadeonIGP family of chipsets.

source code: