[alsa-devel] Ac97 on Au1200- No Sound

Liam Girdwood lg at opensource.wolfsonmicro.com
Mon Feb 11 18:09:47 CET 2008

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.


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