notebook fan runs on idle system

[Martin]

Since upgrading from FC3 to FC4.2 plus rawhide updates, my Centrino
notebook fan is
very audible compared to it being silent in FC3  when the
system is mostly idle.

The load average varies from 0.00 to 0.10, and system monitor shows the
CPU percentage from 3-10%.  No noticeable threads are showing up for
more than a brief second with system monitor.

running 2.6.11-1.1253_FC4, gnome, on Sony PCG-Z1RA.  

Did anything change with the idle loop, or throttling that
could cause this?  Any ways to see more clearly which
threads were recently on the CPU, rather than
at a snapshot in time?

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