CPU at 100% on Natty

[Paul Kaplan]

I did a clean install of Natty to a desktop machine that had been happily running Maverick. Everything seems to work except that the spends most of it's time churning at 100% use and the system feels slow. 


I suspect that this is related to the as yet unsolved regression in the 2.6.38 kernel. How can I downgrade to earlier kernel versions to test this hypothesis? 


Paul 
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