Re: high pitch noise with kernel 2.6 and ACPI (Dell Inspiron 8200)

[Nate Lawson <nate-Y6VGUYTwhu0@public.gmane.org>]

On Wed, 18 Feb 2004, Thomas Glomann wrote:
> On Wednesday 18 February 2004 14:32, Mads Paulin wrote:
> > Hi Thomas,
> >
> > funny you mention it, I thought I was going crazy.
> >
> > I experienced the same thing, and discovered it to be the hard drive.
> >
> > Try to spind the drive down using hdparm and see if that helps.
> >
> nope, putting the drive to sleep doesn't do the trick. the sound remains.
> Moreover I don't see how this "solution" was meant to work? Does the sound
> reappear when you wake up your disk or does it keep silent after a nice
> "onetime" sleep?
> > Obviously this is not a solution, but if it helps, kernel 2.6 could have
> > some other way of controlling the disk than 2.4.
> >
> Still it doesn't explain why that sound is gone when disabling the whole
> acpi-system.
> > The noise disappears when my hdd is under heavy load.
> > - Maybe you just cant here it then, or it actually disappears because it
> > is no longer idle
> >
> well thats true. as long as the disk is Not idle, the noise is gone. But
> returns right after.

Disable cpu idling support or try various combinations of C1-C3.  The
noise is most likely capacitors (dis)charging as part of chipset-supported
clock stopping.  You can detect this case by changing the scheduling
quantum (HZ) to be something other than 1000.

-Nate


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