Update: I've compiled the 4.13.19 kernel without USB 3 support (in the
hope that it would fall back to the USB 2 module - it doesn't - you end
up with no keyboard or trackpad). If you're running a system that has a
BIOS, and it allows you to turn off USB 3.0 support, that seems to be
the only option. Otherwise it appears that you're stuck with
intermittent USB. It sucks that MacBooks don't have ethernet... I'm
using a shared wifi AP even though I have a gigabit cable on my desk :(

There's a ton of USB 3.0 kernel bug tickets on launchpad, and in most
cases they end up expiring due to lack of updates. This one will likely
go the same way.

If ANYONE with a MacBook has managed to get it to work without USB 3.0
in the kernel, post here or PM me.

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https://bugs.launchpad.net/bugs/1668105

Title:
  xhci_hcd module turns off usb host controller on boot

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