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GPO/Admin solution for DisplayPort/HDMI audio preference in Win7

Posted on 2015-01-22
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Last Modified: 2015-02-17
By design, Win7 gives preference to DisplayPort or HDMI audio over other devices.  The problem we have, is that our LCD's (connected via DisplayPort) do NOT actually have audio in them, yet Win7 gives preference to the graphic connection resulting in no sound.  

A less-than-ideal solution would be to manually change/disable/uninstall the audio device or driver after each device is imaged/re-imaged. We could do this.  However, I'm wondering if there is a GPO or deployable solution we could use to eliminate the extra step, potential for missed steps + support calls.

Thanks.
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Question by:fcoa
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by:LeeTutor
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I've requested that this question be deleted for the following reason:

The question has either no comments or not enough useful information to be called an "answer".
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fcoa earned 0 total points
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We ended up identifying the registry key(s) to disable the device via GPO registry preference.  For our Dell OptiPlex 9020 devices that was the following key:

HKLM\SYSTEM\CurrentControlSet\services\IntcDAud\Start = 4 (DWORD)

However, because this change caused the device to be flagged with an alert symbol in Device Manager, we were concerned the flag may cause confusion. So we then went further and identified the following key, which marked the device as disabled in Device Manager.  Using both will ensured the device cannot be re-enabled.

HKLM\SYSTEM\CurrentControlSet\Enum\HDAUDIO\FUNC_01&VEN_8086&DEV_2807&SUBSYS_80860101&REV_1000\4&e3320e1&0&0001\ConfigFlags = 1 (DWORD)

Be aware that a reboot may be required after GPO is applied for settings to take effect. See Microsoft KB165748 for additional detail on this first key.
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by:fcoa
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The solutions specified have been verified to work.  Obviously, the exact key will vary with device hardware.
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