A similar thing happened to me.  I went straight from Dapper to Feisty
Beta.  The cpu governor works properly out of the box, but the default
behavior is different.

>From what I gather, Dapper used powernowd, but Feisty uses kernelmode
governors.  powernowd defaults to ignoring nice'd processes in its load
calculations.  The kernelspace gov doesn't.  If I do

echo 1 > /sys/devices/system/cpu/cpu0/cpufreq/ondemand/ignore_nice_load

the Dapper behavior returns.

-- 
Since update to feisty, CPU fan in laptop won't stop spinning
https://bugs.launchpad.net/bugs/92994
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