http://forum.insanelymac.com/index.php?showtopic=87592&st=40
Check this out...apparently this is our problem...seems to make sence, I always thought it was an ACPI issue and this would confirm this. I tried it but it froze during boot up, no kernel panic...it just froze. Try it and let me know how it works (if at all) but remember to back up your original kexts.