On Mon, 16 Jun 2014, Bjørn Mork wrote:

> Bjørn Mork <[email protected]> writes:
> 
> > So the problem is related to runtime suspend before first use. I
> > strongly suspect 
> >
> >  aae4518b3124 PM / sleep: Mechanism to avoid resuming runtime-suspended 
> > devices unnecessarily
> 
> Nope, that was not it. So if blind guessing isn't going to work, then I
> guess there is no way around a bisect :-)

You could simply wait for someone who knows the code to answer the 
question.  :-)

I'm pretty sure this resulted from one of Dan Williams's changes to USB 
port runtime PM.  A whole bunch of them were added in 3.15-rc1.

Alan Stern

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