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Make sure you have the latest BIOS for your Motherboard. I believe what is happening is that your computer is going to the Default audio which belongs to your Onboard VGA on your motherboard. If you go to Windows Control Panel - Sound, Check the AMD as Default Audio device. Most likely your Default Audio Device is the Realtek Audio and not AMD HD Audio. I imagine that you have in your BIOS check marked Use Dual Graphics on Auto. I don't use a Motherboard with Internal VGA on it. So, I am just taking a stab here, if you checkmark the AMD HD audio as default, you will probably lose your internal VGA Realtek audio. Unfortunately, Only one HD audio can be "Default".
Please read the entire post and look at the pics i uploaded. The AMD HDA driver is not even present in the device manager, and if it is not present then it wont appear in the control panel playback device list. And no, the bios dual graphics setting is set to disable.
But it does not matter right now, i changed the pci bus driver by amd to the default supplied by microsoft and the amd hda device problem is gone.