Seems to be the fix for FreeBSD. How can this info help us to resolve the issue?
http://www.bsdforums.org/forums/showthread.php?t=51654

2007/8/29, Stuart Henderson <stu@spacehopper.org>:
quoted text
> On 2007/08/29 17:12, Vim Visual wrote:
> >
> > "It's really necessary to leave the modem enabled in the BIOS or the
> > hda_intel driver will reutrn azx_get_response timeouts which will lead
> > to a non-working soundchip."
> >
> > What's the connection between these two things??
>
> The "modem" is just an interface between phone line and the
> soundcard. Signal processing is done on the host CPU.
>
> As an aside, that's why you can't use the modem; open-source
> soft DSPs are pretty limited, I only know of spandsp and that
> doesn't do better than v.29. Faster modem protocols are, aiui,
> still quite patent-encumbered.