Acer Aspire 2920: microphone with alsa

PART 1

From: http://ubuntuforums.org/showthread.php?p=4988340

I have written the following line in both files:

• "/etc/modprobe.d/snd-hda-intel.modprobe" (this file must be created)

• "/etc/modprobe.d/alsa-base" (at the bottom in the last line)

Code:

options snd-hda-intel model=acer position_fix=0 enable=yes

PART 2

From: http://www.imhorst.net/ubuntu-on-an-acer-aspire-2920

1) execute the following commands:

    sudo apt-get install module-assistant
    sudo m-a update
    sudo m-a prepare
    sudo m-a a-i alsa
    sudo alsa force-unload
    sudo depmod -ae
    sudo modprobe snd-hda-intel

2) execute

    alsamixer -c 0 -V all

and enable Internal at the last control (Input Source).
that's all... and ... incredibly... it works!!!