Public bug reported:
The Dell Inspiron 1525, which is certified hardware - see
http://webapps.ubuntu.com/certification/list/?category=Laptop - works
out of the box when it comes to internal microphones.
Once an external microphone is plugged in, there is no configuration in
gnome-volume-control that will allow recording from the external
microphone.
Bug #315276 proposes:
echo "options snd-hda-intel model=dell-bios" >> /etc/modprobe.d/alsa-base.conf
Result: I did not see a difference in recording options in gnome-volume-control.
Bug #308564
echo "options snd-hda-intel model=3stack" >> /etc/modprobe.d/alsa-base.conf
Result: External mic now has exclusive access to sound input. Unplugging
external mic and testing all other options in gnome-volume-control does not
allow user to change input source to mic (beside camera) or front mic (beside
SD card reader).
ProblemType: Bug
Architecture: i386
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: ubuntu 3489 F.... mixer_applet2
ubuntu 3947 F.... gnome-volume-co
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xfe9fc000 irq 21'
Mixer name : 'SigmaTel STAC9228'
Components : 'HDA:14f12c06,14f1000f,00100000
HDA:10951392,10280242,00100000 HDA:83847616,10280242,00100201'
Controls : 32
Simple ctrls : 21
DistroRelease: Ubuntu 9.04
Package: alsa-base 1.0.18.dfsg-1ubuntu8
PackageArchitecture: all
ProcEnviron:
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: alsa-driver
Uname: Linux 2.6.28-15-generic i686
** Affects: alsa-driver (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386
--
Dell Inspiron 1525 External Microphone Issues
https://bugs.launchpad.net/bugs/439635
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