On Wed, 2009-08-19 at 00:18 +0100, epic wrote:
> Several mic related bugs maybe solved with this patch or a derived one
>
>
> 1 -My internal-mic was not working and front jack mic sound was
> terrible (useless for headset mic).
>
> 2 -Detected offset level from inputs {line, mic}, this offset level
> increases with specific [boost] and/or [capture(NID 0x23)] gain.
>
> * I just played around several days compiling and testing alsa with my
> acer-alc268, checked all data communication with alc268, pin config etc.
> and tested different values for offset in pins.
>
> * Found internal-mic comes alive with a 50% offset v_reference and mic
> sound is much better.
>
> *This patch applies/solves only for alc268 with option model=acer in
> alsa-base.conf, but i think the others acer-alcxxx bugs maybe solved in
> the same way.
>
> changing PIN_VREF80 to PIN_VREF50 at
> NID 0x18 mic
> NID 0x19 internal-mic
> NID 0x1a line-in (not tested)
>
> *Don't know what can happen to other acer-alcxxx, so i only patched
> acer-alc268. But this patch solved my mic-internal issue and most
> important for me now i can use a headset mic.
>
> *It remains a level offset, lower than before, but mic is usable, the
> level is showed in the pictures.
>
I have acer too (Aspire 5720)
And I also see high DC offsets on both internal and external mics
(and sound quality of internal mic is very bad)
But doesn't help here.
I have set the voltage on the corresonding pins using hda-verb, and I an
hardly notice any difference
(maybe the internal mic is already destroyed by high voltage...)
sudo ./hda-verb /dev/snd/hwC0D0 0x19 SET_PIN_WIDGET_CONTROL 0x21
(this one for internal mic)
Best regards,
Maxim Levitsky
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