Comment 4 for bug 927961

The problem it's Solved!

Run this:

Open /etc/modprobe.d/alsa-base with the following command:

sudo nano /etc/modprobe.d/alsa-base.conf

Add this line in the end file
#NUEVA LINEA
options snd-hda-intel model=asus

Now in the terminal!
wget ftp://ftp.alsa-project.org/pub/driver/alsa-driver-1.0.25.tar.bz2
wget ftp://ftp.alsa-project.org/pub/lib/alsa-lib-1.0.25.tar.bz2
wget ftp://ftp.alsa-project.org/pub/utils/alsa-utils-1.0.25.tar.bz2

Now!
sudo apt-get install libncursesw5-dev build-essential libncurses-dev gettext xmlto xmltoman linux-headers-`uname -r`

Now!

sudo mkdir -p /usr/src/alsa
cd /usr/src/alsa
sudo nautiluz

Go to> /home/usuario/Downloads/
Copy the files: "alsa-driver-1.0.25.tar.bz2", "alsa-lib-1.0.25.tar.bz2", "alsa-utils-1.0.25.tar.bz2"
Go to /usr/src/alsa
Paste the files!

Now!
sudo tar xjf alsa-driver*.bz2
sudo tar xjf alsa-lib*.tar.bz2
sudo tar xjf alsa-utils*.tar.bz2

Now!
cd alsa-driver*
sudo ./configure --with-cards=hda-intel --with-kernel=/usr/src/linux-headers-$(uname -r)
sudo make
sudo make install

Now!
cd ../alsa-lib*
sudo ./configure
sudo make
sudo make install

Now!
sudo ln -s libpanelw.so.5 /usr/lib/libpanelw.so
sudo ln -s libformw.so.5 /usr/lib/libformw.so
sudo ln -s libmenuw.so.5 /usr/lib/libmenuw.so
sudo ln -s libncursesw.so.5 /lib/libncursesw.so

Now!
cd ../alsa-utils*
sudo ./configure
sudo make
sudo make install

Reboot System!

Open a Terminal
Write: alsamixer
Press F6 key
Select 0 HDA Intel
The item "Capture" go to level 25
The item "Internal Mic Boost" go to Level 51
Press Scape Key

Done!