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DateSat, 13 Dec 2003 09:36:54 +0100
FromVojtech Pavlik <>
SubjectRe: Increasing HZ (patch for HZ > 1000)
On Fri, Dec 12, 2003 at 11:45:23PM +0000, Jamie Lokier wrote:
> Vojtech Pavlik wrote:
> > > > I'd advocate lower HZ. Say, oh I dunno...100? This is better for power
> > > > management and also should make the sound go away.
> > > Alas, the sound my Toshiba laptop makes when the CPU is busy is the
> > > same frequency whatever kernel, and by extension whatever the timer
> > > frequency.  I guess it must have another cause :/
> >
> > If it's when the CPU is busy, then it's the CPU's DC/DC converter. There
> > is no way to get rid of the noise without mnodifying the notebook.
> 
> It only does it when the CPU is busy in any low power mode.  In
> maximum power mode it never makes the noise.  It sounds like it's
> coming from the speakers (independent of volume control though), but
> it might not be.
> 
> Would the DC/DC converter noise be explained by a low quality
> capacitor used by the converter?

Yes.

-- 
Vojtech Pavlik
SuSE Labs, SuSE CR
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