Quick question about sound drivers (esp. snd_hda)

Erich Dollansky erich at alogreentechnologies.com
Sat Mar 12 02:30:05 UTC 2011


On Saturday 12 March 2011 04:29:44 Brian Waters wrote:
> It seems to me that under /dev, you can have the following
> sound-related device files:
> dspX
> dspX.Y
> (among others)
this is what you see after your driver is loaded. You might have to tell an application which one to use.

> I'm having some trouble getting my sound to work (Dell Inspiron
> E1705/Inspiron 9400 with Sigmatel STAC9220 codec). I've read the
> manpages for snd and snd_hda (which is the appropriate driver), and
> increased the verbosity of the drivers and read the kernel log and
> /dev/sndstat, but I still can't quite wrap my head around everything.
I have different hardware but I use the same driver. I did not compile it into the kernel after getting into trouble. Since I load it with:

kldload snd_hda

it works as expected. If trouble come up, I kick it our and reload it.

> What I'm wondering is: what exactly is the meaning of X and Y above?
> I'm assuming that X comes from the "association numbers" in the
> snd_hda driver, but I could be wrong. Please correct me!
I do not really know but I have had to tell vlc which to use.


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