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Date: Fri, 29 May 2009 13:16:41 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Frank Bonnet <f.bonnet@esiee.fr>
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Cc: Bruce Cran <bruce@cran.org.uk>, freebsd-questions@freebsd.org
Subject: Re: 7-2 from scratch install , but no sound
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> Mixer vol      is currently set to  75:75
> Mixer pcm      is currently set to  75:75
> Mixer line     is currently set to  75:75
> Mixer mic      is currently set to   0:0
> Mixer cd       is currently set to  75:75
> Mixer rec      is currently set to   0:0
> Mixer igain    is currently set to   0:0
> Mixer ogain    is currently set to  50:50
> Mixer line1    is currently set to  75:75
> Mixer phin     is currently set to   0:0
> Mixer phout    is currently set to   0:0

looks absolutely fine.

i don't know what's gnome doing but try

cat /dev/random >/dev/audio

and tell if you hear the noise