[alsa-devel] HDA Conexant: is mic boost possible?
tdavis at dsl-only.net
Wed Sep 5 03:15:05 CEST 2007
I believe mic boost is on by default. What model are you running this
as? Laptop or Fujitsu?
On Tue, 2007-09-04 at 11:14 -0300, Pablo N. Hess wrote:
> I have to make the sound chip of a Itautec W7635 (= FIC VA250D) work on
> a Gentoo(-based) distro (I'm now trying Sabayon).
> It is a HDA-intel (Conexant codec).
> Using my earphones as a stereo mic, recording with 'arecord -f cd' has
> always worked perfectly fine, from alsa-driver-1.0.14 on.
> However, when using a regular mono mic (like the ones that come in
> common headsets), recording simply does *not* work.
> Here's the quick info:
> playback: ok
> stereo mic: ok
> mono mic: no input at all (very high volume already tried)
> playback: ok (even better than with alsa-driver-1.0.14)
> stereo mic: ok (seems better thatn with alsa-driver-1.0.14)
> mono mic: *very* very low volume, bad quality, lots of low-volume
> noise, too.
> Now the paragraphed info:
> Playback is perfectly ok since alsa-driver-1.0.14, just like recording
> with an earphone as a stereo mic.
> With alsa-driver-1.0.14, definitely no mono-mic input works, no matter
> the settings at alsamixer.
> With alsa-driver-1.0.15rc1, mono-mic input works very very bad
> (extremely low volume, terrible quality, lots of clicks and noise).
> I guess that the mono mic needs a mic boost in alsa-driver-1.0.15rc1.
> However, with a 'grep -i "mic boost" .../pci/hda/*.c'
> (alsa-driver-1.0.15rc1 source code), it seems that only patch-realtek.c
> and patch-analog.c support this feature.
> Is it even possible to add a mic boost feature to this codec?
> The output of alsa-info.sh with alsa-driver-1.0.15rc1 is at:
> Thanks a lot for any info, and congratulations to all of you for your
> terrific work with ALSA.
> Pablo Hess
> Alsa-devel mailing list
> Alsa-devel at alsa-project.org
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