On Fri, Sep 25, 2015 at 10:26:23AM -0400, Alan Stern wrote:
>> Does this mean I have a long bisect ahead of me?
> In the absence of any better suggestions, that's the most 
> straightforward way to get an answer.

Three hours of bisecting (actually three bisects; I found a git bug along the
way :-/) later shows the culprit:

  commit 2d2a316765d956bc5cb6bb367b2ec52ca59ab8e9
  Author: Lu Baolu <baolu...@linux.intel.com>
  Date:   Tue Jun 16 09:08:26 2015 +0800
  
      usb: core: lpm: set lpm_capable for root hub device

I have no idea whatsoever how this breaks bandwidth management, but seemingly
it does.

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