[alsa-devel] no external mic

Raymond Yau superquad.vortex2 at gmail.com
Fri Mar 25 02:19:21 CET 2011

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

Refer to the owner of Dell Vostro 1500


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

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