[alsa-devel] Ac97 on Au1200- No Sound

[Nitin Mahajan]

HI!
--- Liam Girdwood <lg at opensource.wolfsonmicro.com>
wrote:

> On Fri, 2008-02-08 at 12:00 +0000, Nitin Mahajan
> wrote:
> > HI!
> > 
> > I am working with a Au1200 based board and trying
> to
> > make the audio(AC97 + STAC9752) work after
> applying
> > the ASoC patch at
> > http://opensource.wolfsonmicro.com/~git/asoc/.
> > 
> > After writing the machine driver for my board
> based on
> > the exmmb-ac97.c as a template, my codec is being
> > detected, which is on PSC1.
> > 
> > But when I play some .wav file using aplay, I get
> to
> > hear the sound with a very low volume, which is
> almost
> > not recognizable.
> 
> It sounds like the AC97 link is up and running and
> your DMA is sending
> PCM data to the codec.
> 
> > 
> > I unmuted the codec with these two commands
> > 
> > #amixer set "Master" 255 unmute
> > #amixer set "PCM" 255 unmute
> > 
> > I also tried to watch /proc/interrupts but I am
> not
> > able to see any interrupts coming on IRQ 11 that
> is
> > for PSC1.
> > 
> > Could some one provide more insight into what
> might be
> > going wrong?
> > 
> 
> Can you try using alsamixer. It's possible you are
> not unmuting the
> correct kcontrols.
> 
> Liam
> 
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> 
Using alsamixer, I unmuted every possible control
there , but it did not work. Only when I used amixer
to unmute the controls, they really got unmuted.

regards

-Nitin

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