From owner-freebsd-multimedia@FreeBSD.ORG  Mon Dec 22 22:58:01 2008
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Date: Mon, 22 Dec 2008 23:57:58 +0200
From: Alexander Motin <mav@FreeBSD.org>
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To: Alastair Hogge <agh@coolrhaug.com>
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Cc: freebsd-multimedia@freebsd.org
Subject: Re: Intel HDA (IDT 92HD73E) on a DPS45G audio problems.
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Alastair Hogge wrote:
> I have a Intel DPS45G mainboard [1], running 7.1-PRERELEASE on it. When I load 
> the snd_hda.ko the system will pick up the audio hardware as:
> pcm0: <Intel (Unknown) High Definition Audio Controller> mem 
> 0xc3420000-0xc3423fff irq 22 at device 27.0 on pci0
> pcm0: [ITHREAD]
> pcm0: <HDA Codec: Unknown Codec>
> pcm0: <HDA Driver Revision: 20080420_0052>
> But no dsp nodes are created in /dev until I try to mplayer/sidplay something. 
> Even so, I still hear nothing coming from my speakers. I've also tried cat 
> some/wave/file > dev/dsp0.0 after the dsp0.0 node is created from running 
> mplayer or sidplay.
> 
> Is this just a missing device definition somewhere?
> 
> cat /dev/sndstat:
> FreeBSD Audio Driver (newpcm: 32bit 2007061600/i386)
> Installed devices:
> pcm0: <Intel (Unknown) High Definition Audio Controller> at memory 0xc3420000 
> irq 22 kld snd_hda [20080420_0052] [MPSAFE] (1p:1v/1r:1v channels duplex 
> default)

Try updated snd_hda driver:
http://people.freebsd.org/~mav/
or just take it from CURRENT, and don't forget to read updated man page.

-- 
Alexander Motin