Radeon

radeon is a family of the X.Org graphics drivers for modern ATI Radeon graphics cards.

See also radeon in the conventional Gentoo Wiki.

Kernel
You need to activate the following kernel options, note that you don't need to enable AGP Support if your card doesn't sit in a AGP slot:

Firmware
There is IRQ microcode for r6xx/r7xx/Evergreen/Northern Islands Radeon GPUs and APUs. KMS may not work without it. It can be installed with:

Make sure firmware for your model (check available ones in /lib/firmware/radeon) is included in kernel:

Below is a list of the firmware files needed for each family of cards:

Driver
You can force X11 to use desired driver with:

Configuration and Setup
Your user has to be in the video group to be able to use the hardware acceleration:

Links

 * X.Org Wiki - radeon
 * X.Org Wiki - radeonhd (old driver project, deprecated in favour of 'radeon')