Subject: Re: [BUG 2579] linux 2.6.* sound problems
From: Lee Revell <rlrevell@joe-job.com>
To: patrizio.bassi@gmail.com
Cc: "Kernel," <linux-kernel@vger.kernel.org>
In-Reply-To: <436638A8.3000604@gmail.com>
References: <436638A8.3000604@gmail.com>
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Date: Mon, 31 Oct 2005 12:15:28 -0500
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On Mon, 2005-10-31 at 16:30 +0100, Patrizio Bassi wrote:
> starting from 2.6.0 (2 years ago) i have the following bug.
> 
> link: http://bugzilla.kernel.org/show_bug.cgi?id=2579
> and https://bugtrack.alsa-project.org/alsa-bug/view.php?id=230
> 
> fast summary:
> when playing audio and using a bit the harddisk (i.e. md5sum of a 200mb
> file)
> i hear noises, related to disk activity. more hd is used, more chicks
> and ZZZZ noises happen.
> 
> linux 2.4.x and windows has no problems, perfect.
> tried module/standalone alsa drivers.

Your problem is a "singing capacitor", caused by cheap motherboard
components.  The problem appeared in 2.6.0 because that's when the timer
frequency changed from 100HZ to 1000HZ.

Starting with 2.6.14 you can work around this by compiling with HZ set
to 250 or 100.  But it's fundamentally a hardware problem.

Lee

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