[alsa-devel] Wonder if VT1708A has Mic Boost or not

Takashi Iwai tiwai at suse.de
Fri May 29 12:31:24 CEST 2009

At Thu, 28 May 2009 10:39:27 +0200,
Konstantin Kletschke wrote:
> Hi Folks!
> I have a mini-PC here which should record Voice over Microphone. The
> Level is not really loud enough and the alsa-driver-1.0.19 doesn't
> reveal a mic boost setting in its mixer. 
> This of course may be of the driver not yet being adapted to the special
> motherboard AFAIK.
> What I wonder is, is the Mic Boost setting/function integrated in this
> chip itself or does hardware vendor need to implement external opamps
> for this? If it is integrated into the chip itself I could try to
> modifiy the code to make the setting public.

Judging from the codec amp capabilities of the possible pins, it seems
missing.  You could change the vref level, though.

Anyway, to be sure, could you run alsa-info.sh with --no-upload
option, and attach the generated file?

> Is there a source for a datasheet anywhere for the VT1708A?

Not sure...  Does anyone know of public one?



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