Comment 6 for bug 1359803

My laptop is Acer Aspire E1-572G, and i have the same problem. Im using Razer Kraken Pro headsets and its as if the headset microphone didnt exist, its essentialy used as headphones.
The Sound settings show Microphone(built-in audio) and Analog Input(built-in audio), both recording the same thing, and nothing changes when the headset is plugged in.
I have windows-ubuntu dual boot, and the headset works well on windowsI. I can acess both internal and external microphone, and it changes automaticly for most applications.

Following some answers on the web i tried adding options to /etc/modprobe.d/alsa-base.conf, but it didnt work.
I used the options described on this answer:
http://askubuntu.com/questions/75828/external-microphone-not-working?rq=1