Windows 8.1: USB MIDI Device Works on USB 2.0 Port, Doesn’t Work on USB 3.0 Port
Some USB MIDI devices have been found to not function correctly when plugged into a USB 3.0 port on Windows 8.1, but will work fine on USB 2.0 ports and also work fine on all USB ports on Windows 8.0.
The issue is that on Windows 8.1 the USB 3.0 hub driver will allow a request for a MS OS feature descriptor to be forwarded to a USB 1.1 device, whereas on Windows 8.0 it would not. A small subset of USB devices do not handle these requests correctly, and will end up getting confused after they receive such a request. Microsoft is currently investigating a fix for this issue.
It is possible that some non-MIDI devices are affected by this problem, but none are known so far.
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