Right-click the 'Unknown' (USB) item and choose the "Update Driver Software…" option,.Search your system to find the usbhub3.inf file location –I found it within C:\Windows\WinSxS subfolders. (the earliest dated *.inf file): 7/23/15 "Device configured (usbhub3.inf)" Status: The drivers for this device are not installed. Properties: Intel(R) USB 3.0 eXtensible Host Controller - 0100 (Microsoft) Open Control Panel, Device Manager to check for your USB device(s) listed as 'Unknown' under "Other" devices, and take note of the spec's.Workaround/Remedy: Manually reinstall the driver. I believe I have reason to really suspect that the USB drivers (and the reluctance of the manufacturer to advance them for the 8.1 OS…) are really at the root of the problem but, anyway, here’s how I remedied this: I also found that I would lose my USB ports- yet inconsistently so -when either other Windows Updates had been installed or I simply placed a certain microSD plug- w/ its USB adapter -into one of the USB ports (I guess the system couldn’t handle the shock of an 8GB microSD?). I had the same/similar USB port loss-problem with my HP Pavilion 11-n010dx x360 laptop with Windows 8.1, and I didn’t have the aforementioned problem-Windows Update (or its ‘child’ updates) to begin with.
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May 2023
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