Any way to disable specific CPU sleep modes on Core i5 mobile?

I just got a new Toshiba Tecra S11 notebook, which has a Core i5 520M CPU, and it appears to suffer from a well-known problem: a high pitched noise when the CPU is idle.

Googling around revealed that this is caused by a specific power-saving mode in the CPU. In most cases, C4 mode is blamed for the noise.

So my question is: is it possible to disable C4 mode (or any other "sleep" mode) using some utility or BIOS setting? I don't mind if it hurts battery life.

I'd appreciate any advice on this matter. It's driving me crazy.

FYI: I'm running Windows 7 64-bit
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More about disable specific sleep modes core mobile
  1. get into your BIOS if you can and disable some of the settings in the CPU section.

    A pretty general answer, but you can always return your BIOS to its original settings if you need too......

    Whe overclocking its common for people to disable ALL of the advanced power saving features. I would just try and disable like Speedstep thing or one at a time diable each of the settings and see which works best for power/performance/batterlife/volume levels.
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