Surface 4 UEFI Onboard Audio Disable

[smocom]

I recently received the Surface Pro 4. It is necessary for me to disable On-Board Audio in the UEFI Devices. This is a feature available in the Surface Pro 3 UEFI, and this microsoft link link suggests that disabling On-Board Audio is an available feature for Surface Pro 4 too. However, I cannot find it in the devices list. I am current on all SW/FW updates. Does anyone know whether this feature is permanently gone, or whether there is an alternate UEFI download available that includes this device in the UEFI?

I tried contacting Microsoft but was unsuccessful in getting answers.

Thanks!

 

[smocom]

Update! I have seen another Surface Pro 4 WITH the ability to turn off on-board audio in the UEFI. But I cannot figure out why mine does not have this feature. We have the exact same firmware and other drivers as seen in the UEFI. Could it be that mine is the advanced surface with the i7 processor and Iris graphics, while the other is the HD graphics with the i5 processor? Please chime in if you have an idea on how I might proceed.

Thank You.