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

[Dominik Brodowski <linux-X3ehHDuj6sIIGcDfoQAp7BvVK+yQ3ZXh@public.gmane.org>]

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Maybe this is caused by the CPU being put into an idle mode (C-State). If
the HD is active, bm_activity [*] will be high and C3 will be disabled for
this time, so you won't hear the noise then. The difference between 2.4. and
2.6. is the different HZ value -- in 2.4., the sound was of ~100Hz
frequency, now it's 1kHz...

	Dominik

[*] you can see that in /proc/acpi/processor/*/power

On Wed, Feb 18, 2004 at 08:17:47PM +0100, 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.
> 
> > Regards
> > Mads
> 
> So any other ideas?
> 
> 
> Thomas
> 
> 
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