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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