Re: [linux-audio-user] HD noise with SB Live card

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Subject: Re: [linux-audio-user] HD noise with SB Live card
From: Paul Winkler (pw_lists_AT_slinkp.com)
Date: Fri Aug 30 2002 - 01:30:13 EEST


Well, that's an interesting one. I don't have a solution for you,
but if you find one, be sure to send it to me - I'll add it
to the crufty old AudioQuality HOWTO.

--PW

On Mon, Aug 26, 2002 at 01:02:19PM -0700, Josh Green wrote:
> The problem I'm having is most likely not Linux specific, but I only run
> Linux so I can't test to see if it also occurs in other OSes.
> The problem is that I'm getting quite a lot of noise (little bleeps and
> static) in the digital sound output of my SB Live card. If I do a large
> copy of a file or something to really give the hard disk a work out, any
> PCM audio output becomes totally in-audible as it is overwhelmed by
> noise.
>
> I'm convinced that this noise is not being picked up from the sound card
> via electro-magnetic interference. The reason I think this is because
> this all started when I changed motherboards from one with a K6-2 to a
> PIII. Also if I disable DMA on the hard disk (hdparm -d 0 /dev/hda) the
> problem goes away completely. Of course not having DMA is a real drag
> for real time audio work.
>
> If anyone has some knowledge as to what could be causing this, I would
> love to hear it. I'm not real familiar with how the SB Live transfers
> audio internally. I'm curious if there is something broken with the DMA
> controller on my motherboard or perhaps some sort of conflict. It almost
> sounds like the audio buffer is getting directly trashed (noise isn't
> mixed with PCM audio, it replaces it).
>
> Right now I'm looking to just get another motherboard, but I would like
> to avoid this if possible. Cheers.
> Josh Green

-- 
--

Paul Winkler "Welcome to Muppet Labs, where the future is made - today!"


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