I think Alex was onto something in that thread: http://lists.x.org/archives/xorg-devel/2009-May/000816.html
The Ubuntu changes introduced in this version is mainly his jumbo patch "radeon: add support for RS600, R6xx, and R7xx GPUs" http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-jaunty.git;a=commit;h=85568da345d4348f33c69043c9bc4e78ad819706
I think Alex was onto something in that thread: http:// lists.x. org/archives/ xorg-devel/ 2009-May/ 000816. html
The Ubuntu changes introduced in this version is mainly his jumbo patch "radeon: add support for RS600, R6xx, and R7xx GPUs" http:// kernel. ubuntu. com/git? p=ubuntu/ ubuntu- jaunty. git;a=commit; h=85568da345d43 48f33c69043c9bc 4e78ad819706