From: Vojtech Pavlik <vojtech@suse.cz>
To: Jamie Lokier <jamie@shareable.org>
Cc: Vojtech Pavlik <vojtech@suse.cz>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: Increasing HZ (patch for HZ > 1000)
Date: Sat, 13 Dec 2003 09:36:54 +0100 [thread overview]
Message-ID: <20031213083654.GA32110@ucw.cz> (raw)
In-Reply-To: <20031212234523.GE15935@mail.shareable.org>
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
next prev parent reply other threads:[~2003-12-13 8:37 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-11 19:22 Increasing HZ (patch for HZ > 1000) Grover, Andrew
2003-12-12 22:31 ` Jamie Lokier
2003-12-12 22:58 ` Vojtech Pavlik
2003-12-12 23:45 ` Jamie Lokier
2003-12-13 8:36 ` Vojtech Pavlik [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-12-12 15:52 Vincent Legoll
2003-12-11 6:05 Jean-Marc Valin
2003-12-11 7:07 ` Martin J. Bligh
2003-12-11 7:15 ` Jean-Marc Valin
2003-12-11 7:18 ` Martin J. Bligh
2003-12-11 17:18 ` Gene Heskett
2003-12-11 17:33 ` Martin J. Bligh
2003-12-11 18:10 ` Richard B. Johnson
2003-12-11 19:14 ` Gene Heskett
2003-12-11 18:35 ` Gene Heskett
2003-12-12 22:08 ` Pavel Machek
2003-12-12 22:57 ` Jean-Marc Valin
2003-12-12 23:18 ` Måns Rullgård
2003-12-12 23:40 ` Pavel Machek
2003-12-13 2:25 ` Måns Rullgård
2003-12-16 3:04 ` john stultz
2003-12-16 5:20 ` Mitchell Blank Jr
2003-12-14 1:05 ` bill davidsen
2003-12-14 4:48 ` Pat Erley
2003-12-11 7:30 ` Nick Piggin
2003-12-11 8:25 ` Tim Schmielau
2003-12-12 8:00 ` Jean-Marc Valin
2003-12-12 22:10 ` Pavel Machek
2003-12-12 22:50 ` Jean-Marc Valin
2004-01-03 18:16 ` Bill Davidsen
[not found] ` <010f01c415a4_27033d00_d100000a@sbs2003.local>
2004-04-06 13:00 ` Pavel Machek
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