GNU/Linux Desktop Survival Guide by Graham Williams
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Rhesus Troubleshooting

12.04 Upgrade: Sound Input Issues

After upgrading, recording audio from the internal mic or from an external mic resulting in a very noisey/scratchy background and low quality voice. Solution was found to add the following to /etc/apt/sources.list:

deb http://ppa.launchpad.net/ubuntu-audio-dev/alsa-daily/ubuntu precise main
deb-src http://ppa.launchpad.net/ubuntu-audio-dev/alsa-daily/ubuntu precise main

The install the latest version of the sound driver:

$ wajig install alsa-hda-dkms

Then reboot:

$ sudo reboot

Sound was much better. Now has a level of contstant white noise in the background. On advice I also added the following to /etc/modprobe.d/alsa-base.conf, but made little difference to the background noise - so stay with it for now - sounds okay.

options snd-hda-intel model=asus

Note that the built in microphone is working just fine too.