Intel vs. Radeon vs. Nouveau On Linux 3.15 + Mesa 10.3-devel

It's also possible to squeeze a few more frames out of the Radeon graphics cards using some yet-to-be-mainlined patches and toying around with some environment variables, but as usual, our testing is mostly focused upon the experience users will have when running the mentioned software components in their stock / out-of-the-box state -- it's after all, what most Linux desktop users will encounter.

As soon as the Nouveau and Radeon regressions clear-up, a much larger comparison will be definitely interesting.