I have a Mac Mini 4,1. I get no sound at all except when I play through the internal speaker. Currently sound is supposed to go through the HDMI cable to the TV. I can see the HDMI output in the sound settings, but I get no love from the speakers. I've double checked the connection as sound works just fine in OSX. This is my first stab at using Ubuntu so ELI5 please.
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Have you checked this: http://askubuntu.com/questions/285624/ubuntu-13-04-not-detect-the-hdmi-sound-output – Manuel May 30 '13 at 15:53
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@Manuel He uses Ubuntu 12.04, not 13.04 as the user in the other question. – Rodrigo Oliveira May 30 '13 at 16:05
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The headphone jack works just fine. No sound through HDMI. And the power the TV on and off and every combination offers no love. – Charliticus May 30 '13 at 21:19
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I've upgraded to 12.10. And no luck. – Charliticus Jun 02 '13 at 05:15
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I upgraded to 13 whatever and the sound works now – Charliticus Jun 07 '13 at 17:18
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I have a MacMini as well, same 12.04 haven't solved the issue but have a workaround.
Whenever the monitor/TV is not on during the boot process the sound doesn't work. I normally reboot or put the computer into sleep mode and wake it up again. The sound then works. Mine works with OSX as well but with Ubuntu I need to go through this odd workaround.

Meer Borg
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Plot twist: The headphone jack works just fine. No sound through HDMI. And the power the TV on and off and every combination offers no love. – Charliticus May 30 '13 at 21:08
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@Charliticus you know that their are about 3 types of HDMI cables? They have versions like 1.3 1.4 or something, so maybe the cable? It's a slim chance, but I got caught on that once. – Meer Borg May 30 '13 at 21:43
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