Re: xhci isoc : Not enough bandwidth for altsetting 6

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On Thu, 4 Nov 2010, Sarah Sharp wrote:

> But the real issue is that the UVC driver can use less bandwidth than
> the device specifies in its endpoint descriptors, but there's no way for
> the xHCI driver to know that.  It can only use the interval and max
> packet size advertised in the endpoint descriptor.  There needs to be a
> new API for USB video drivers to tell the xHCI driver what the real
> bandwidth expectations are.  Until then, your webcam won't work under
> xHCI.

But this same objection applies when the camera is plugged into a 
USB-2.0 controller.  Since it works then, it should also work with 
xHCI.

Alan Stern

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