PI have same issue
Refreshed surface and the unknown device se was gone...
Then installed the whole bunch of updates and latest firmware and its back
Its amazing every time i have issues with my surface it is software/driver related.
Last time it was the drivers not updating after new firmware
When is Microsoft going to release reliable drivers for this device?!?!
seriously
The annoying part is that this unknown device is draining our battery making the devices lifespan shorter... Guess its Microsoft's new selling strategy, kill the battery so they'll have to buy a new one?!
ATM Ive reset the surface 2 to its factory settings and updated it. However unknown device still there draining my battery. Heres a report:



In the last report I noticed it saying that NVidia Tegra Audio prevents the system of going into automatic standby. Anyone else seeing this as well?