Re: usb3 hubs and usb2 virtual hubs

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On Tue, 6 Sep 2011, Don Zickus wrote:

> Hi Sarah,
> 
> I setup a system that has a VIA usb3 hub connected to an Intel Panther
> Point usb3 root hub.  On top of that I stuck a usb3 Western Digital
> harddrive behind the VIA usb3 hub.  It looks like below
> 
> usb3 PP (root hub) -> usb3 VIA (hub) -> usb3 WD disk
> 
> I noticed on boot up I get a bunch of 'Device not responding to set
> address.'  Looking further it seems to be on the virtual usb2 side of the
> usb3 hub (3-3), whereas everything is fine on the usb3 side of the usb3
> hub (4-3).
> 
> I am sure there is some probing that has to happen to detect if the device
> is connected on the usb2 or usb3 bus. But I didn't expect it to be noisy
> if things failed.  Any pointers on where to look to figure this out?
> 
> Thanks,
> Don
> 
> lsusb output
> (bus 004 device 002 is supposed to be the VIA hub)
> 
> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
> Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
> Bus 001 Device 003: ID 0624:0291 Avocent Corp. 
> Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> Bus 004 Device 002: ID 2109:0810  
> Bus 004 Device 003: ID 1058:0730 Western Digital Technologies, Inc. 

Shouldn't there be an entry listing bus 003 device 002 for the VIA 
hub's USB-2 component?

Alan STern

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