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I recently installed ubuntu 13.10, and have been having a lot of problems with sound. I am using my ati 4670 to display picture (which works great) and sound (which doesn't work at all) through hdmi. I have gone through many threads and in many it appears people cannot get the hdmi sound option to appear, which is not my case. The option appears in gnome alsa mixer and pulse audio. I have checked to make sure the hdmi sound is the primary sound output with no luck in gnome and pulse. I have also installed the oem-audio-hda-daily-dms without luck. Please help, thanks

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this may help in case you use the open radeon driver: askubuntu.com/questions/67113/… –  Takkat Apr 6 '14 at 18:52

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