On Thu, 12 Jul 2007, Thierry Goubier wrote:

> The problem is that there is no device I am aware of (or willing to use) on
> the port 3 of this hub. The hub is in a board with a wifi chip, a VFD,
> multimedia keys, and a usb out port connected to a memory card reader... So
> removing it is easy, but I lose all other devices as well.

I see.  So you're stuck with misbehaving hardware.

> I have been told that under Windows, the port 3 is labeled as unknown
> device...
> 
> Note that, say, the memory card reader manages to work reasonably well
> through the faulty hub, except that detection of inserted media doesn't
> really work...
> 
> So what I would need is probably a change in ehci-hcd to make it oblivious
> to that port3 (or more error-resilient?). If you have any idea how to do
> that, I'd be very happy to implement it...

No, this has nothing to do with ehci-hcd.  You would need to change the 
USB hub driver, so that it could be told to ignore certain ports on 
certain hubs.  It could be done, but I'm not sure whether it would 
really solve the problem.

Did you ever post a dmesg log with CONFIG_USB_DEBUG turned on?

Alan Stern


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