1,update to 10.6.7, reboot, no problem. 
  
2,install chameleon,reboot, no problem. 
  
3,apply EDP1.7, option 1 with powerpark, reboot, fail:  
"panic cpu0...SleepEnable..." 
  
4,apply EDP1.7, option 1 without powerpark, reboot, fail:  
"panic cpu1...ACPI..." 
  
5,roll back to the original /Extra, reboot, ok 
  
any idea on my case? 
  
btw, my latitude is D620 with nvidia. 
  
Thx in advance!