7870 + i5 2500 Some questions

[zoomblab]

Hi, I run Kubuntu 12.04. The only easy way to benchmark that I know is the Mozilla HDACCEL. Previously, with the i5 alone, I was getting 60+ FPS. Now, with the 7870, I am getting 31 FPS.

glxinfo says:

OpenGL vendor string: VMware, Inc.
OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 0x300)
OpenGL version string: 2.1 Mesa 8.0.1
OpenGL shading language version string: 1.20

I guess that means just CPU rendering. So I have a couple of questions.

1. How can I configure which video card and driver to run? I would like to revert to the i5 for now.
2. I know that the radeon open source drivers progress fast. However what is the exact procedure to download and install the latest drivers? I read phoronix all the time, I know how to compile simple programs, though linux drivers look like a jungle to me (MESA, KMS, DRM, DRI, DDX, ...). Does an easy to follow guide exists?