Comment 13 for bug 92994

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.