linux-kernel - Re: [RFC][PATCH] cpuidle: avoid singing capacitors

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Message-ID: <75b66ecd0803011827qd64e1f2ud593fedbec33abe9@mail.gmail.com>
Date:	Sat, 1 Mar 2008 21:27:09 -0500
From:	"Lee Revell" <rlrevell@...-job.com>
To:	"Pierre Ossman" <drzeus-list@...eus.cx>
Cc:	"Venkatesh Pallipadi" <venkatesh.pallipadi@...el.com>,
	"Adam Belay" <abelay@...ell.com>,
	linux-pm@...ts.linux-foundation.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH] cpuidle: avoid singing capacitors

On Fri, Feb 29, 2008 at 1:38 PM, Pierre Ossman <drzeus-list@...eus.cx> wrote:
> Many devices today are of a less than stellar quality, and singing
>  transistors are a common problem. A high-pitch noise is created, caused
>  by power fluctuations as the processor enters and leaves deep sleep at
>  a high frequency.
>
>  Instead of just disabling the deep sleep (which wastes power). This
>  patch merely reduces the number of times it is entered so that the
>  frequency doesn't exceed 500 Hz. That should make sure the problem is
>  inaudible.

Should there be a comment stating the motivation for the change?

Thanks for trying to address this problem, I know many users who are afflicted.

Lee
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