Re: [pwc] Difficulties with a QuickCam 4000 Pro and USB2.0 hubs

[matthieu castet <>]

Hi,

Raymond wrote:
> Hi all!
> P.S. As a side note, if I run "lsusb", I notice that if the camera is 
> picked up on bus 1, it fails and if it's picked up on bus 2 it succeeds 
> (this is all the same physical port on the computer). I'm guessing if 
> the first device plugged in (a hub or an "actual" device) is usb1.1 the 
> firmware assigns it to bus 2 otherwise it becomes bus 1 ... not sure if 
> that's a "normal" way of doing things or if it's something OQO have done 
> ...
Yes that standard way of doing things :
the usb2 controller only manage high speed device. When a low/full speed 
is detected it route the device to a "companion" controller which 
support usb 1.
I suppose on our computer you have 2 drivers for usb controller : ehci 
for usb2 and ohci/uhci for usb1. What happen if you unload/disable ehci 
driver ?

Matthieu
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