SB16: Bad or missing 16 bit DMA channel

Hello,

I have a SB sound card, model CT4170 plugged into an ISA slot of a Epox mother board, model EP-MVP3G5.

Every hour or so I see this in /var/log/messages:

modprobe: modprobe: Can't locate module sound-service-0-0
kernel: Soundblaster audio driver Copyright (C) by Hannu Savolainen 1993-1996
kernel: sb: Creative ViBRA16X PnP detected
kernel: sb: ISAPnP reports 'Creative ViBRA16X PnP' at i/o 0x220, irq 5, dma 1, 3
kernel: SB 4.16 detected OK (220)
kernel: SB16: Bad or missing 16 bit DMA channel
kernel: sb: 1 Soundblaster PnP card(s) found.

I'm wondering why the kernel needs sound-service-0-0 module, which fails to load, when my sound works just fine without it, apparently?

I am also wondering what is causing "SB16: Bad or missing 16 bit DMA channel" warnings?

This is what I have in /etc/modules.conf:

alias sound-slot-0 sb
post-install sound-slot-0 /bin/aumix-minimal -f /etc/.aumixrc -L >/dev/null 2>&1 || :
pre-remove sound-slot-0 /bin/aumix-minimal -f /etc/.aumixrc -S >/dev/null 2>&1 || :

Should I remove or change this?
I can't remember why I put this in modules.conf nor what it does, any more. :(

Thanks,
Otis

_________________________________________________________________
iVillage.com: Solutions for Your Life
Check out the most exciting women's community on the Web
http://www.ivillage.com

Chances are the module is automatically unloaded after a time of non use and then re-loaded automatically by kmod when something tries to access /dev/dsp.

sound-service-0-0 is /dev/mixer. The same program that is accessing /dev/dsp causing the driver to re-load is probably the same one accessing /dev/mixer and causing the sound-servic-0-0 message. If you want these messages to go away, in /etc/modules.conf you can enter a line 'alias sound-service-0-0 off' or 'alias sound-services-0-0 sb' to have it auto-load the module.

Here's the deal. The ViBRA16X is unlike any other Creative Soundblaster card in that it requires two 8 bit DMA instead of one 8 bit and one 16 bit dma. It also handles full duplex operation differently than any other soundblaster card. Nobody has taken the time to make it work properly. The message is a result of the soundblaster driver expecting the second DMA to be 16 bit when in fact for this card an 8 bit DMA is used. Don't worry about it, your card will still playback or record just fine. It just wont do both at once.

No need to remove this. It simply causes the mixer settings in /etc/.aumixrc to be loaded after the sound driver is loaded.