Subject: Re: Help testing for USB ethernet/xHCI regression

From: Mark Lord <[email-masked]>
Date: Thu, 30 Jan 2014 14:45:36 -0500

On 14-01-30 01:44 PM, Sarah Sharp wrote:
..
> Since the USB ethernet scatter-gather support wasn't added until the
> 3.12 kernel, it's unlikely that the xHCI TD fragment issue is actually
> the root cause.
> 
> The interesting piece of information in that report is that when the USB
> 3.0 device falls back to USB 2.0 speeds under xHCI, it works.

Could be due to something related to the max URB length:

USB 2.0 High-Speed: max URB length 512.
USB 3.0 Super-Speed: max URB length 1024.

Cheers
-- 
Mark Lord
Real-Time Remedies Inc.
[email-masked]