Missing Ethernet Network Adapter

dzule_ · Mar 21, 2017

Hi all, I am currently using Asus laptop model X751L and since updated to Windows 10, my ethernet adapter when missing from the device manager, I thought it could be a driver issue but it is completely missing from device manager. I even tried to update it from Asus' website and upon updating this error would appear. "The Realtek Network Controller was not found. If Deep Sleep Mode is enabled Please Plug the Cable." Could this be a hardware issue since wireless connection still works. Please helpp

alth0triplemadang · Mar 21, 2017

Ethernet LAN controller and wireless controller is a separate hardware with different driver.
Looks like the LAN controller is on "sleep mode" or disabled in BIOS.
Did you try to refresh the device manager again or enable the Ethernet in BIOS?
Also disable the S3 deep sleep state mode and any LAN and I/O power saving features or plug the cable from router to Ethernet to wake the LAN controller, see if it helps.

This problem are also appeared on many HP mini netbook models and some of HP pavilion models.

boosted1g · Mar 21, 2017

Try plugging laptop in to wall AC power.
It is default on many laptops to dissable ethernet when on battery power.

If it still does not detect ethernet port then you may have a problem.

dzule_ · Mar 21, 2017

alth0triplemadang :

I tried checking on the bios and there were no options where I can enable the ethernet. If I recall correctly, this problem happened after I updated windows from 8.1 to 10. Could that be possible problem? Also, what do you mean by disabling S3 deep sleep state mode.

dzule_ · Mar 21, 2017

boosted1g :

My laptop is plugged in most of the time and is seems to be not the problem. hmmm

alth0triplemadang · Mar 22, 2017

dzule_ :

It could be.

Explanation about sleep states:
https://msdn.microsoft.com/en-us/library/windows/hardware/ff564575(v=vs.85).aspx
It will answer your question about S3 deep sleep state.

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