Intel Security and Microsoft worked together to verify the functionality of the Surface Pro 4 and changes were applied both in the Microsoft firmware and MDE code. Please ensure you are running the current Microsoft UEFI firmware (Which appears you are) and the updated Hardware Comparability XML attached to the bottom of KB81900.
Note: After updating the HWComp XML, the system will need to be reactivated either by using the DETech Standalone disk to emergency boot the system or by decrypting and deactivating the system by deselecting the "Enable Policy" option in the Product Policy and reactivating after the system shows "Inactive" in the Drive Encryption Status Monitor.
If you are still seeing the behavior after updating the HWComp XML, please open a service request with us and we will gladly further investigate this issue.
Many thanks for the response. I can confirm we are running a much older version of the HWComp XML file. By implementing this file, is there any risk or impact to existing encrypted computers? We are nervous of making changes to the encryption product and don't know the full implication of what uploading this file will do and there is no easy way to test the impact of this change. Do you have any advice/experience?
The settings in the HWComp XML file are only applied to systems when they activate. Systems already activated will not be affected in any way by updating the XML. This is why you must deactivate and reactivate or emergency boot to apply these settings to a system.
Thanks for the reply, that is good to know, however we are currently deploying Encryption using the offline activation method (as part of our automated build process) How to Use Offline Activation for Endpoint Encryption for PC v7 (EEPC)
Does the XML file get included during the creation of the offline package (when the ePO policy is exported) meaning I will have to re-create this package, or will it apply once the offline activated computer connects to the ePO server? Is there a method to add it to an offline installation?