Radeon

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

Kernel
You need to activate the following kernel options:

Firmware
There is IRQ microcode for r6xx/r7xx/Evergreen/Northern Islands Radeon GPUs and APUs. It can be installed with:

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 - radeonhd
 * X.Org Wiki - radeon (legacy)