Separate control of AC97 audio connectors?

[Inacio]

Hello,

I am trying to control (disable/enable/set the volume) of the front
and back audio connectors of an AC´97 audio device.

Right now when I plug a speaker in the back connector and a phone in
the front connector, both play audio at the same time. I would like to
be able to control that, as well as the mic levels.

Some documents about the AC´97 architecture indicate that this would
depend on the software and drivers that are installed. But I have
upgraded the driver and still am not able to do it.

Do you know if this separate control for the AC´97 hardware is
feasible? How can I do that?

Thanks in advance,

Inacio.

 

[Paul]

Hello,

I am trying to control (disable/enable/set the volume) of the front
and back audio connectors of an AC´97 audio device.

Right now when I plug a speaker in the back connector and a phone in
the front connector, both play audio at the same time. I would like to
be able to control that, as well as the mic levels.

Some documents about the AC´97 architecture indicate that this would
depend on the software and drivers that are installed. But I have
upgraded the driver and still am not able to do it.

Do you know if this separate control for the AC´97 hardware is
feasible? How can I do that?

Thanks in advance,

Inacio.

On AC'97, the Lineout on the back of the computer, and the headphone
jack on the front of the computer, use the same signal. The front
connector is allowed to "mute" the signal on Lineout, when headphones
are plugged in; But not all computer case wiring and headphone jack,
are compliant with that muting feature. That could be why you are
getting the same signal on the headphone jack, and the Lineout on
the back of the computer.

If you had an HDaudio CODEC on the motherboard, those have separate
output signals for the headphone jack, and for Lineout on the back
of the computer. But AC'97 has fewer I/O than HDaudio.

There are two possible microphone inputs. One on the back of the computer,
plus a separate one on the front of the computer. Usually, the user has
to switch between "MIC 1" and "MIC 2", using a tick box or selector
in the audio control panel or mixer. The MIC should have a volume
control, and perhaps a 20dB "boost" tick box.

I would not expect the drivers to change so radically, as to change the
behavior of the ports. I expect, what you currently see, is all that you
are going to get.

Paul