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This question already has an answer here:

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 https://askubuntu.com/a/232407/45985 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,
Dan

marked as duplicate by Takkat, user117103, 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.

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

  • 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
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The solution was to change the GRUB_CMDLINE_LINUX line in /etc/default/grub from GRUB_CMDLINE_LINUX="" to GRUB_CMDLINE_LINUX="radeon.audio=1" then run update-grub and restart.

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