kernel 3.2.0-30-generic, doesn't support raedon ati drivers, Why?

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http://askubuntu.com – I upgraded my kernel to 3.2.0-30-generic. Since the new kernel install my ati drivers are no more supported. I've tried reinstalling the ati drivers manually. But the process doesn't seem to help. I am using amd raedon : 6400 series 1Gb graphic card. I have been following this link previously:- Correct way to install ati drivers Please provide your valuable inputs. (HowTos)