ATI Radeon

modulename: radeon.ko

configname: CONFIG_DRM_RADEON

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Direct Rendering Manager (XFree86 4.1.0 and higher DRI support)
└─>PCI support
└─>/dev/agpgart (AGP Support)
└─>/dev/agpgart (AGP Support)
└─>ATI Radeon
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Choose this option if you have an ATI Radeon graphics card. There
are both PCI and AGP versions. You don't need to choose this to
run the Radeon in plain VGA mode.

If M is selected, the module will be called radeon.

source code:
drivers/gpu/drm//radeon/


is selected by
CONFIG_DRM_RADEON_USERPTR