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I know this question has been asked a million times, but none of the things I've tried from other answers have worked. I've got a Caicos HDMI Audio [Radeon HD 6400 Series] audio device and I've installed "PulseAudio Volume Control" after reading this thread and I can see "Radeon HD 6400" listed in the output devices and see the volume meter moving when I try to playback audio, but nothing comes through the speakers.
aplay -l outputs:

**** List of PLAYBACK Hardware Devices ****
card 0: SB [HDA ATI SB], device 0: VT1708S Analog [VT1708S Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: SB [HDA ATI SB], device 3: VT1708S Digital [VT1708S Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: Generic [HD-Audio Generic], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Screenshot of alsamixer

I can also see the "output bar" moving as if it were playing audio, but still no sound from the speakers...

Any ideas?

Thanks in advance,

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marked as duplicate by Takkat, guntbert, Eliah Kagan, Eric Carvalho, Alaa Ali Sep 9 '13 at 17:23

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

I had this same symptom and the problem turned out to be that the spdif outputs were muted in alsamixer.

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I added a link to a screenshot of my alsamixer. The spdifs aren't muted, but they don't have any volume scales... – danwoods Jul 28 '13 at 17:09
Looking at the screen shot, the only other thing I have that is different is that I have auto mute disables. – bcbarnes Jul 28 '13 at 23:18
Disabled auto-mute and no change. Thanks though... – danwoods Jul 28 '13 at 23:35
up vote 0 down vote accepted

The solution was to change the GRUB_CMDLINE_LINUX line in /etc/default/grub from GRUB_CMDLINE_LINUX="" to GRUB_CMDLINE_LINUX="" then run update-grub and restart.

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