I've since gone into the configuration properties of the RealTek hardware device in the Device Manager, and on the Power Management Tab I unchecked "Allow the computer to turn off this device to save power". So I think, for whatever is going wrong, the adapter needs to be power cycled in the dock to bring it back alive. No more yellow ! in the devices list either. Bingo, the RealTek adapter re-appeared and was functioning properly. So knowing that the adapter was in the dock, and not the PC, I then disconnected the power supply from the dock, undocked the slate, re-attached the power cord to the dock and re-docked the slate. Then when I went to check its properties, it disappeared. Not so fast! Curious, I switched back to the original dock, and the RealTek adapter was present and working! Several hours later, I noticed that the Slate had switched back to Wireless, and the wired Ethernet adapter was showing a yellow ! in the devices list when I checked for it. So, my first impression was that I had a bad dock. I had a 2nd dock, and after plugging that in and docking the S7S in it, the RealTek adapter came back. So even after docking/undocking the slate in the tablet, once the wired Ethernet was gone, it stayed gone.
I learned that the RealTek PCIe GBE Family Controller exists in the dock itself, not in the tablet. So far, I've solved the problem (fingers crossed) by doing a little experiment first. the wired Ethernet kept disconnecting and auto switching to wireless, or the RealTek adapter disappeared altogether while the tablet was docked in its Samsung docking station.
SURFACE ETHERNET ADAPTER NOT WORKING SERIES
I was having the same issue on my Samsung Series 7 Slate.
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