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That's great news! I got a firmware update last week, and the notes stated: "Surface UEFI update (v1.51116.18.0) adds ability within Windows Power & sleep settings to turn off Wi-Fi during sleep." I was hoping it was fixed, but haven't had a chance to test it yet.

Here's my sleep study for the last few days. Hibernate definitely seems to play a part. I haven't changed the hibernate time yet, but for some reason, my surface has been refusing to hibernate anyway. As you can see, apart from the top 2 readings, I've had no problems at all the last few days...

Not sure what's going on, but my Surface now seems to be behaving itself until it hibernates. It's using a fairly consistent 50-70mW per hour without disabling the wireless through device manager, but with the box to enable wifi during sleep unticked. I've put it to sleep many times, and...

Thanks mate...that rules that out!

Thanks for getting back to me. I'm gonna keep at it for a few days, then maybe get in touch with support on Monday. I'll let you know if I come across any solutions. I suspect a lot of people are experiencing this without realising. I only found the sleepstudy tool as my surface failed to...

Did you ever get this sorted. I'm having exactly the same issues. The only thing that seems to work 100% is disabling the adapter. I don get some connected standby sessions when the system will use very little power, but these are few and far between. Interestingly, I have had session where...