Since it's affecting both xorg and framebuffer I'm guessing kernel problem.
Can you please try with the latest kernel: 
http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.33-rc6/
Just to make sure it hasn't already been fixed.

-- 
[HD4550] Xorg freeze
https://bugs.launchpad.net/bugs/518309
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