Re: intel8x0, ad198x, no sound

[Jeffrey Baker <jwbaker@acm.org>]

On Sun, May 18, 2003 at 12:46:17PM -0700, Jeffrey Baker wrote:
> This is related to the mail last week regarding the Asus P4PE with
> ad1980 sound chip.  I got an Asus P4P800 with the ad1985.  The
> intel8x0 driver works but there are problems with the sound routing.
> There is no sound at all coming from the main (line out) output.
> If I plug headphones into the line in jack, there is sound but it
> appears to be some kind of surround output, because it lacks all low
> frequencies entirely.  No sound comes from the microphone jack.
> 
> I think the problem may be related to the "intelligent" jack sensing
> built into this hardware.  It is supposed to be able to detect when
> you've got your headphones plugged into the wrong jack and reroute
> the audio.  Either that, or the chip is stuck in some surround mode
> that isn't quite working.

Hi.  It helps to read the datasheet.  Although this isn't stated in
the motherboard's documentation, the headphone amplifier is, in
fact, connected to the line-in jack.  There is a register (0x76)
which controls the input for the headphone amp.  It can be either 0
for the surround DAC or 1 for the mixer.  By default it is 0.  This
explains why I am hearing high-passed surround audio from the
headphones.

I glanced at intel8x0.c, but it wasn't immediately obvious how to
set registers on the codec.

-jwb


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