I found the following very helpful (still testing):
http://setiathome.berkeley.edu/forum_thread.php?id=43189
gconf-editor may need to installed via yum. -George
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CPU frequency gets stuck at the lowest frequency after resume from suspend
(ThinkPad T60p)
https://bugs.launchpad.net/bugs/138465
I can confirm the same behavior on the following Fedora 8 32bit system:
Linux host 2.6.23.1-49.fc8 #1 SMP Thu Nov 8 21:41:26 EST 2007 i686 i686
i386 GNU/Linux
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 CPU