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From: George Hartzell <hartzell@alerce.com>
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Date: Sun, 22 Jul 2007 18:54:37 -0700
To: Ariff Abdullah <ariff@FreeBSD.org>
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Cc: freebsd-multimedia@freebsd.org
Subject: Re: HDA sound problem on mac pro running -STABLE
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Ariff Abdullah writes:
 > On Sun, 22 Jul 2007 15:44:38 -0700
 > George Hartzell <hartzell@alerce.com> wrote:
 > > 
 > > I have a mac pro running -STABLE from a couple of days ago.
 > > 
 > > If I load the sound and snd_hda modules I can play an mp3 file with
 > > mpg123, BUT even with the mixer vol and pcm set to 100:100 it's only
 > > just barely audible.
 > > 
 > > There's dmesg and sysctl info at:
 > > 
 > >   http://shrimp.alerce.com/misc/delicious-dmesg-verbose.txt
 > >   http://shrimp.alerce.com/misc/delicious-sysctl
 > > 
 > > I've tried picking up Ariff's binary modules, and I've tried setting
 > > 
 > >   hint.pcm.0.softpcmvol=1
 > > 
 > > and 
 > > 
 > >   hint.pcm.0.config="softpcmvol"
 > > 
 > > using kenv and then reloading the driver, with no improvement.
 > > 
 > > Anyone know how I can get the volume to behave?
 > > 
 > 
 > Try "gpio0" 1,2,3, .. 7, or any combination of it.
 > 
 > My time a bit tight right now, unless you willing to
 > irc://irc.freenode.net @ #freebsd-azalia.
 > [...]

Hmmm.  

  hint.pcm.0.config="gpio0"

sends the sound out the internal speakers, even with external speakers
plugged in.
  
  hint.pcm.0.config="gpio1"

sends the sound out to the external speakers!  Yay!

Thanks for the hint!

g.