[alsa-devel] [PATCH]alsa:patch_realtek.c iMac9,1 sound fixes.

[Justin P. Mattock]

What seemed to be a simple little task of getting the microphone
to work, ended up becoming a bigger task than I had set out.
(oh-well, good learning experience).

Anyways below you will find an updated patch to the iMac9,1 machine
which fixes some issues that I found.(keep in mind this is still a work
in progress). 

First issue:
With the original patch, I've noticed by unmuting the mic
(and even having it muted), there is a distorted("Noise")
coming from the internal speakers, even when the headphones are plugged in.
What my finding's revealed is:

	/* Mic (rear) pin: input vref at 80% */
	{0x18, AC_VERB_SET_PIN_WIDGET_CONTROL, PIN_VREF80},
	{0x18, AC_VERB_SET_AMP_GAIN_MUTE, AMP_OUT_MUTE},