Since I can't edit my old post here is an update with a few changes and
references. You may also go here for thread discussion and possible
updates as well on the ubuntu forums found here
http://ubuntuforums.org/showthread.php?p=2422276#post2422276.

Method A:
The ALSA update sets the mic input to mic number 2 so you have to return it to 
number 1 for default mic. Using GNOME/XFCE GUI may have no effect. You have to 
use the alsa mixer on by typing alsamixer on the terminal. Use the left and 
right arrow keys to navigate the column setting. Press left until you reach 
<Mic Sele> and you will see that it is set to Mic2 use up/down arrow keys to 
toggle the setting to Mic1. Mute Mic Column by pressing down all the way to the 
bottom. Go to Capture tab by pressing tab until you get there. Then go to Mic 
column again and press spacebar the word CAPTUR and L R appears on the column. 
Bring volume up by pressing up arrow(doesn't really work but another guide said 
to do this, taken form a Gentoo post which i have not bookmarked and don't know 
here to look). The Capture column should have the same markings and bring the 
volume up as well. You may have to use sudo if regular user can't set anything. 
If this has no effect use Method B. This hasn't worked for me either but it 
worked for others.

Here some more info by ComputerGuy56 found here
http://ubuntuforums.org/showthread.php?t=382106 on a similar solution.

Method B:
Even if you use GNOME or XFCE and since their own sound control GUIs seems to 
have no effect including the alsamixer, install the kmix package. I know it 
sounds weird installing kmix and you're not even using KDE believe me strangely 
enough it works. After installation run kmix, it might not appear in the 
application menu so use terminal instead. Go to the input section locate mic 
and select mic 1. You should immediately hear sound input from your mic. Close 
kmix and you may uninstall it after this. For me and other users this actually 
did the trick.

Method C:
If all else fails you have to reset and cleanly reinstall ALSA and the Linux 
sound modules. You can even make without Method A and B and use this instead. 
Am not very sure about the result on this one but you could provide your 
experience on what happens. This method taken from the Comprehensive Sound 
Probelm Solutions Guide - Getting the ALSA drivers from a *fresh* kernel 
section found here http://ubuntuforums.org/showthread.p...ensive+so und. Refer 
to the guide first before doing anything.

Via the terminal run the following commands:

1) To remove the related packages and configuration files:

sudo apt-get --purge remove linux-sound-base alsa-base alsa-utils

This will also uninstall gnome-desktop, xubuntu-desktop and GDM on
Ubuntu/Xubuntu so just reinstall them as well.

2) Reinstall those same packages:

sudo apt-get install linux-sound-base alsa-base alsa-utils

3) Reinstall GDM and the desktop package:

sudo apt-get install gdm ubuntu-desktop (ubuntu)

Reinstall GDM and the desktop package:

sudo apt-get install gdm xubuntu-desktop (xubuntu)


Cheers!!!

GaryBrlow

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Microphone not working
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