It turns out that I only have two USB 3.0 devices - the GoPro Hero 5 is only USB 2.0, despite having a Type C connector. I used Ubuntu 16.10 on both the system with working USB 3.0 and the new system. Unfortunately, there are problems with Linux (or at least Ubuntu 16.10) not having handy driver support for some of my devices. Thanks for the suggestion - it does make it possible to easily see things in more detail. I'm not super familiar with the guts of USB on Linux - how do I tell if Linux is accessing USB via EHCI or xHCI?Īlso, just for further clarification - the USB 3.0 thumbdrive will work if you physically force USB 2.0 by using a USB 2.0 extension cable, and it definitely works at USB 3.0 speeds in my main desktop (which has the ill-fated Etron EJ168A controller) The odds of an Intel driver problem on an MS OS are low, but nothing's impossible. I realize that I should have tried downgrading first (I suspect that xHCI has been knocked out by codesharing with other motherboards and nobody's noticed it yet) but that is no longer possible. If it doesn't, it *might* be a hardware bug (but could also be that Windows and Linux both have driver issues with the hardware on that mobo). If it does, then it's definitely a Windows 10 software/driver problem. Ubuntu 16.10), and see if it'll recognize the USB 3.0 thumbdrive. Try booting a recent Linux live distro (e.g. I assume you updated to the latest BIOS already?
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