Possible Hibernate CPU Throttling bug

I was resuming my T61 from hibernate yesterday and I decided to load cpu-z. I was surprised to see that my T61 was overclocking itself! I was clocking itself at 2.1 ghz and it even clocked up to 2.3 ghz at times! It even did it while in idle after it was done booting up. I decided to change power profiles and see if it would keep it up, I switch over to battery mode even though it was on a/c without the battery installed. It throttled itself down to 800mhz, so I it rules out cpu-z malfunctioning.

I was putting absolutely no load on the cpu to be causing it to act this way. The power profile I had it set to when I saw the overclocking was Power Optimized. Theres nothing that really explains it, most of the time the clock speed wouldn't go past 1.2ghz when on a/c without the battery.

Does this sound like a Vista bug?

 

Maybe it's by design? See http://www.trustedreviews.com/notebooks/review/2007/04/17/Intel-Santa-Rosa-Revealed/p2 and http://www.reghardware.co.uk/2007/04/16/intel_confirms_laptop_core2extreme/. It's referred to as Enhanced Dynamic Acceleration.

 

That's where it steals power from one core to bump up another, right? Pretty cool feature if it's safe, and I imagine it is since most of these can definitely take a little more speed (and it's probably running off the same voltage, since the second core isn't being used as much)

 

Saneless has it correct. Processors which are included with Santa Rosa can chnage their clockspeed independantly from core to core. If a task is single threaded, its very inefficient for a dual core processor. So, instead it increases the clockspeed on one core, and reduces proportionally on the other core. This results in the task being completed faster, but the thermal output of the processor remaing constant. Quite clever, really.