Re: USB 3.0 Hub Downgrading to 2.0 Speeds Automatically

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On Fri, 11 Feb 2011, Sarah Sharp wrote:

> Greg, the USB 3.0 hub patches didn't make it into 2.6.38.  The hub
> enumeration process should just fail because the USB core doesn't know
> to ask for the new USB 3.0 hub descriptor.  I'm still working out the
> architecture of the USB 3.0 hub/split roothub patches with Alan Stern
> (although I haven't had time recently to do a rev of the patches based
> on his last suggestions).
> 
> I have no idea why the USB 3.0 devices behind that hub would work at USB
> 3.0 speeds on 2.6.38 if we don't have USB 3.0 hub support.

They didn't work at USB 3.0 speed.  The only times Joshua saw the
drives running that fast were when he connected them directly to the 
computer -- no external hub.

Alan Stern

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