All the tips/hints/fixes/other information posted here are at your own risk. Some of the steps here could result in damage to your computer. For example, using a Windows registry editor like RegEdit could result in unintended serious changes that may be difficult or impossible to reverse. Backups are always encouraged.

16 March 2008

Fixing the High Pitched Noise

If you're Intel-powered laptop has a high-pitched noise problem, this might be the solution (copied from Yubastard's post at TabletPCReview)

I knew RMClock was the tool but didn't know how to use it until tonight. The above "Run HLT..." option works because it takes the CPU out of the Hard C4 state(battery), you can see Task Manager @ 100% (because RMClock idles instead of Windows), thus reducing battery life noticiably.

Instead, use these settings:
  1. Management page:
    • uncheck: "Use OS load-based management"
    • uncheck: "Run HLT command when OS is idle(requires restart)"
    • check: "Restore CPU defaults..." - both options
    • select: from the "CPU defaults selection" drop-down menu: "CPU-defined default FID/VID"
  2. Profiles page(if you know what ur doin'):
    • for AC power choose Maximal Performance profile and, under AC tab, check "Use P-States..." and "Use Throttling(ODCM)", use index #6 for both.
    • for battery power choose Power Saving profile and, under battery tab, check "Use P-States..." and use index #1, unckeck "Use Throttling(ODCM)", or, alternatively, use "Performance on Demand" profile and check nothing.
  3. Advanced CPU Settings page:
    • Processor Tab:
      • uncheck: "Enable Thermal Monitor 1" (makes CPU jumpy when it gets hot, that's why there's TM2)
      • check: "Enable Thermal Monior 2" (replaces TM1)
      • check these Enhanced Low Power States: C1E, C2E, Hard C4E.
    • Platform Tab:
      • check: "Enable Popdown Mode"
      • THE MOST IMPORTANT!! uncheck: "Enable Popup Mode"

That last one is the most important as it's the one that silences the noise! All of the other ones where just to preserve battery life and keep everything safe if you exit RMClock. You can also check: "Run application automatically when Windows session starts" for hassle-free power management (tho' it seems to keep working after you exit!).

Press "Apply" and ur done... but wait, these settings, if improperly set, may heat up any computer, so, please, do it at your own risk. I'm a computer engineering student and know my way around, more or less, but it works and preserves battery, on my Core Duo T2500 2.0Ghz with BIOS version 78.03, haven't tested it with newer 78.04.

Also, it pumps it up on AC power, without too much heating or jumpyness after long standby.

Hope it works for other Core Duo users and even Pentium M, and I hope I was clear enough. I wish I could keep experimenting and try to get more life out of battery but it's 5:30am and I'm tired. @ least, I don't have the whinning anymore and have more than 4 hours of battery life

I forgot!!!

In "Adavcend CPU Setings" page, check the "Apply these settings at startup", beside the Refresh button, at bottom.

This is so when you restart, these power management settings will kick in.

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