For those having problems with here's temporary fix:

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. You may have to use sudo if regular user can't set 
anything. If this has no effect use Method B.

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 wierd 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.

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. 
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)

All this were tested using feisty and may also be applicable to edgy and
dapper. Please try it out and see what works best for you.


Cheers!!!


GaryBrlow

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Microphone not working
https://bugs.launchpad.net/bugs/80531
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