[ubuntu] Build in microphone doesn`t working on Toshiba Satellite P305 notebbook

view story

Hello I have Ubuntu 9.10 on my Toshiba Satellite P305 notebook with 2.6.31-12 kernel and have one little problem. My buld in microphone doesn't work. Then i try to record some sound, all, what i see is a little noise. The build in microphone it self exist in alsamixer and it set on maximum. It has worked before, then i have Windows Vista on this notebook. Is it possible to make this microphone work? What other, except alsamixer i should check, to found the problem? ()