Re: usb3 hubs and usb2 virtual hubs

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On Wed, Sep 07, 2011 at 05:44:37PM +0800, Andiry Xu wrote:
> On Tue, 2011-09-06 at 19:33 -0400, Alan Stern wrote:
> > > 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
> > 
> > --
> 
> The hub's USB-2 component fails to initialize, so it does not show up in
> lsusb.
> 
> I wonder if this issue occur with hot plug? Or it can only be seen on
> cold boot with the hub plugged in.

I tried hotplugging a few times with no luck.  Even after unplugging
everything from the hub.

Cheers,
Don
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