Can you use a USB3.0 hub?

Hans Petter Selasky hselasky at
Thu Jan 12 21:25:46 UTC 2012

On Thursday 12 January 2012 07:15:17 Kohji Okuno wrote:
> Hi,
> Can you use a USB3.0 hub?
> I tried a USB3.0 hub (BUFFALO BSH4A04U3BK).
> And I used 8-stable and PCI-E card (BUFFALO IFC-PCIE2U3)
> The hub is for only japanese market.
> The card is NEC’s 720200 chip
> -30-pci-express-interface-card/
> The kernel could not recognize USB3.0 HDD that connected to this hub
> as the following log. But, the kernel could reconize USB2.0 HDD that
> connected to this hub.
> Regards,
>  Kohji Okuno


There is a problem with USB 3.0 HUBs, most likely something related to the 
XHCI route string or USB HUB set depth.

I don't have a USB 3.0 analyzer, so I cannot find this out quickly. If you 
could help debug, would be great. Here is a patch which you can put on top of 
8/9- or 10- stable:

It fixes a few issues, but not all.


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