AMD has released a new graphics proprietary driver for Linux.
The new feature of Catalyst 13.4 for Linux supports all Radeon HD 5000/6000/7000 videocards.
You can download Catalyst 13.4 for Linux from here.
The new Catalyst 13.4 for Linux is an OpenGL 4.2 - GL_VERSION: 4.0.12217 Core Profile Context 12.104 driver.