linux-kernel - Re: [Alsa-devel] Loud POP from sound system during module init w/ 2.6.19

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Date:	Tue, 19 Dec 2006 11:06:33 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	"Ian E. Morgan" <penguin.wrangler@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, perex@...e.cz,
	alsa-devel@...a-project.org, emu10k1-devel@...ts.sourceforge.net
Subject: Re: [Alsa-devel] Loud POP from sound system during module init w/ 2.6.19

At Fri, 8 Dec 2006 13:53:46 -0500,
Ian E. Morgan wrote:
> 
> Since upgrading to 2.6.19, two of my boxes (one workstation, one
> notebook) started making a very loud (and scary) POP from the sound
> system when the alsa modules are loaded. Unloading and reloading the
> modules will generate another pop.
> 
> I have removed any fiddling of mixer settings during module
> load/unload; same results.
> 
> I have complied the kernel both with and without
> CONFIG_SND_AC97_POWER_SAVE; same results.
> 
> The workstation uses snd_emu10k1, the notebook snd_intel8x0, so it's
> affecting more than a single driver.
> 
> Anybody else seeing this behaviour and know how to stop it?

Hm, interesting.  I thought this should be avoided by disabling
CONFIG_SND_AC97_POWER_SAVE Kconfig.

Do you get the noise at unloading or at loading time?
If it's at unloading time, it's likely in some part of
snd_ac97_powerdown(), handling of AC97_POWERDOWN bits, I guess.


Takashi
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