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Date: Mon, 25 Feb 2013 08:51:42 -0600
From: Seth Forshee <seth.forshee@canonical.com>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Christian Lamparter <chunkeey@googlemail.com>,
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	"Chen, Stephen" <scchen@qca.qualcomm.com>,
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Subject: Re: carl9170 A-MPDU transmit problem
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On Sun, Feb 24, 2013 at 06:41:06PM -0500, Alan Stern wrote:
> >  Or can you think of any other "interesting"
> > bits that could help to explain why the "Arrandale box [...] worked
> > perfectly" whereas (all his) Ivy Bridge ones have problems.
> > (Of course, I assume that it is always the same device, the
> > same firmware and the same kernel drivers in all tests, right)?
> 
> No, not really.  Unless one is using USB-2 and the other USB-3 -- the 
> device might have a bug in its USB-3 firmware.

This appears to be a high-speed device; at least, dmesg says "new
high-speed USB device ..." when I plug it in. So for the firmware isn't
it USB 2.0 even when plugged in a SuperSpeed port?

> What happens if xhci-hcd is unloaded before the test?

I'll test this, but I need to rebuild first. xhci-hcd is currently
built-in to my kenel.

Seth