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From: "Yan V. Batuto" <batuto@hotbox.ru>
To: Dan Foster <dsf@globalcrossing.net>
Date: Tue, 16 Dec 2003 13:58:58 +0300
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Subject: Re: 5.2-RELEASE TODO
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> > Just my $0.02: Problem #1 is not confined to -CURRENT too.
> > I hear crackles in the output sound on my old pentium running 4.9-stable. And
> > soundcard there is "simple SB16" too -- ISA CL4135 (afair). 
> > (Sorry, I can't reach it in the moment to get full dmesg.)
> > It looks like crackles occurs during disk activity -- they sounds exactly 
> > synchronously with IDE LED blinking. I tried to switch vchans on and off,
> > but without any audible changes.
> 
> Crackling, from my understanding, usually means timing problems...
> especially if it can't get enough time to do its stuff.
> 
> In your case, perhaps some sort of pre-emption due to servicing ATA disk
> requests, indirectly causing sound driver timing issues?
May be. But why it occurs only with selected cards?.. 
I tried to play with pci aureal 8820 card and had a fresh sound in contrast to cl4135, 
but snd_au8820.ko, based on ancient binaries released by dying company
is too buggy and unstable. :(
So, I'd say that may be something wrong in "simple SB16" code...
I'll be very appreciate If anybody suggest me any idea about how and where I should dig this trouble.

Yan.