Intel EXA acceleration

[Lukas Hejtmanek]

Hello,

I noticed some updates to the EXA code in Xserver git head. Unfortunately,
I still need to use MigrationHeuristics Greedy to have virtual desktop
switching fast. In the EXA man page, there is stated that this option should
not be needed. Does anybody care? I'm open to help investigation as much as
possible.

I have Ubuntu/unstable on x86_64. I use complete Xorg distribution from
git/master branch. I do not use compiz or any compositon manager (including
the Xserver one).

-- 
Lukáš Hejtmánek