[alsa-devel] no external mic

[Takashi Iwai]

At Fri, 25 Mar 2011 09:19:21 +0800,
Raymond Yau wrote:
> 
> 2011/3/23 leon <leon3000 at gawab.com>
> 
> >
> > Hello,
> > i've Laptop Dell Inspiron 1520,
> > the internal mic works perfectly, but external mic doesn't work,
> >
> > i've followed this link:
> > http://ubuntuforums.org/showthread.php?p=10352564
> > but it didn't help me,
> >
> > here's the output of ALSA Information Script:
> > http://www.alsa-project.org/db/?f=3aa8a44412081f533b2de3e32aae76ff4370eae9
> > btw, i've been using Ubuntu, and Debian now, both have same
> > problem. so i haven't tried other Distributions.
> >
> > any idea?
> >
> 
> The digital mic at 0x17 is connected to [audio selector] 0x1d
> 
> The other analog input (e.g. ext mic 0x0b,..) are connected to [audio
> selector] 0x19
> 
> [audio selector 0x1d] can select either 0x17 or 0x19
> 
> There are two [audio selector] in the audio path from input pins to [Audio
> Input]
> 
> Refer to the owner of Dell Vostro 1500
> 
> https://bugtrack.alsa-project.org/alsa-bug/view.php?id=5288
> 
> It seem that alsa-driver-1.0.24 still has these bug since tthe driver does
> not call set_mic_route() to setup those dmix_idx of mux_idx of ext mic and
> digital mic

Does the problem still persist with the very latest tree?
There have been some fixes regarding mic pins for IDT codecs.  This was
added after 2.6.38 release.


Takashi