Please see:

Simple mixer control 'Headphone',0
  Capabilities: pvolume pswitch penum
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 87
  Mono:
  Front Left: Playback 87 [100%] [0.00dB] [off]  <---
  Front Right: Playback 87 [100%] [0.00dB] [off]  <---
Simple mixer control 'Speaker',0
  Capabilities: pvolume pswitch penum
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 87
  Mono:
  Front Left: Playback 87 [100%] [0.00dB] [off]  <---
  Front Right: Playback 87 [100%] [0.00dB] [off]  <---

I.e., both your speaker and headphone outputs are muted.  You may find
that you need to install and use pavucontrol if you're not using GNOME.

** Changed in: alsa-driver (Ubuntu)
       Status: New => Invalid

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sound dont work on snd_hda_intel Ubuntu 10.04.1
https://bugs.launchpad.net/bugs/662615
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