Internal laptop Microphone with very low gain - HDA-Intel SigmaTel STAC9228

Paulo Cavalcanti promac at
Sat Aug 15 11:59:59 UTC 2009

On Sat, Aug 15, 2009 at 8:42 AM, Vini Engel <vini at> wrote:

> Tim said the following on 08/14/2009 10:01 PM:
>> On Fri, 2009-08-14 at 01:41 +1000, Vini Engel wrote:
>>> I was wondering if anyone has ever been able to resolve the issues
>>> that exist with the sound card below and the low gain of the internal
>>> microphone of the laptop. The mic works and so does the external one
>>> when plugged, the problem is that the volume of everything captured by
>>> the internal mic extremely low and almost impossible to hear
>>> sometimes.
>> Are their hidden mixer options which include a "mic boost"?  It
>> increases the gain of the input amplifier.  You may need it off to
>> record really loud sounds (where turning the level down doesn't stop the
>> pre-amp from clipping ahead of the level control), or you may need it on
>> to increase the gain.  It's an option that's often needed.
> I can remember that most windows machines have it. I haven't seen this
> option on a linux machine for a while. I do agree with you I need that
> option to make my mic work well but that option is no where to be found.
> I found something for alsa which creates a pseudo booster, it kind of works
> but puts a lot of noisy in the sounds and not all applications can see it.
> Do you or does anyone know hot to enable to mic boot option?
There is no such option for the driver you are using.
It is an alsa problem. I also have a dell laptop with the same problem.
Mic too low. You can file a bug report on ALSA site, or ask in the forum.
I have already done that in the past, and got no solution.

Paulo Roma Cavalcanti
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