Ubuntu 14.10 Offers AMD Radeon Driver Performance Improvements
Warsow seems to run into some odd regressions under Ubuntu 14.10.
More performance improvements for RadeonSI Gallium3D on Ubuntu 14.10 when running the popular, open-source Xonotic first person shooter.
Plot3D has performance improvements with the newer code when using the AMD GCN GPUs (Radeon HD 7000 series and newer).