From alsa-user-owner@alsa.jcu.cz  Sat Jun 27 12:13:31 1998
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Date: Sat, 27 Jun 1998 12:12:55 +0200 (MET DST)
From: Jaroslav Kysela <perex@jcu.cz>
To: Eric Sharkey <sharkey@fatman.physics.sunysb.edu>
cc: alsa-user@jcu.cz, reinier.mostert@bigfoot.com
Subject: Re: SB 16 hangs my PPro when playing sound 
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On Fri, 26 Jun 1998, Eric Sharkey wrote:

> > Hi,
> > 
> > I tried removing the 16bit dma setting from my conf.modules, but alsa still
> > detected it after restarting snd driver.  I also checked /proc/dma, it gives:
> > 1: SB 16
> > 4: cascade
> > 5: SB 16
> > 
> > Will it show if there's a DMA clash?

You should write 'snd_dma16=-1' as options for insmod if you want disable
16-bit DMA channel for SB16.

> 
> Not necessarily.
> 
> > What specific tests can I do?
> 
> Instead of removing the 16bit DMA setting, try changing it to 7 or something.
> 
> Assuming you had your old SB working on DMA 1, try playing in 8bit mode:
> 
> mpg123 --8bit file.mp3
> 
> assuming you use mpg123 to play mp3's.
> 
> This should use the 8bit DMA instead of the 16bit DMA.  If you don't have
> any crashes, you know it's a problem with 16bit mode.

It isn't true for auto DMA settings for SB16. 16-bit DMA channel is
always used as first. You should use proc interface (/proc/sound/0/sb16)
to prefer some DMA channel for specific direction - look to FAQ how can be
this done..

> 
> Eric
> 
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-----
Jaroslav Kysela <perex@jcu.cz>
Academic Computer Centre, University of South Bohemia
Branisovska 31, C. Budejovice, CZ-370 05 Czech Republic


