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No digital audio output in Ubuntu 12.04

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linux-howto

http://askubuntu.com – I just installed Ubuntu 12.04 LTS on my ACER Aspire 5738. There are two options in the All settings > Sound section through which the sound can be played, 1. Digital output (S/PDIF) (Built-in Audio) & 2.Speakers (Built-in Audio). But if I select Digital output (1st option), there is no sound and problem with the second option is that the quality of the sound is not good, while previously with 11.10, it was good. (HowTos)