Please try unmuting and raising the following mixer element using
`alsamixer` in an Applications > Accessories > Terminal:

Simple mixer control 'Master Mono',0
  Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum
  Playback channels: Mono
  Limits: Playback 0 - 31
  Mono: Playback 0 [0%] [-46.50dB] [off]  <---

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

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[ICH4 - Intel ICH5] ALSA test tone not correctly played back (silent)
https://bugs.launchpad.net/bugs/672020
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