Could you try with gnome-alsamixer please.

This for the gnome desktop, e.g. Ubuntu

Open a terminal and install with 'sudo apt-get install gnome-alsamixer'
Then to run 'gnone-alsamixer'
When Gnome ALSA Mixer window appears go to Edit>Sound Card Properties and check 
that the appropriate functions are checked. e.g. mic.
Close and return to Gnome ALSA Mixer and check that your function isn't muted. 
Apply two thirds volume. 

Does this help rectify your lack of function?

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https://bugs.launchpad.net/bugs/714875

Title:
  [Realtek ALC259] ALSA test tone not correctly played back. Sound works
  on Win7 with laptop speakers, sound works on Ubuntu 10.10 with
  headphones, but not with laptop speakers

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