On Sun, 20 Aug 2006, Søren Ræbild wrote:

> Alan Stern wrote:
> 
> >
> >Wow!  That's a pretty impressive error.  I don't recall ever seeing 
> >anything like it.  It affected both the high-speed EHCI controller and its 
> >full-speed companion UHCI controller.
> >
> >  
> >
> I was hoping for something simple ;-(
> 
> >This isn't just a protocol problem; it's a fault at the hardware level.  
> >At a guess, one of the USB controllers on your motherboard has an
> >intermittent short circuit.  Or maybe it's in the cable or the GL811E 
> >controller.
> >
> >Of course, that doesn't explain why everything works okay on the old 2.4 
> >kernel.
> >
> >Have you tried switch cables or using a different computer?
> >  
> >
> I just tried another cable, but that didn't work any better.
> 
> It works OK on my wifes laptop running Windows, but Knoppix with the 2.6
> kernel fails on her computer as well. And it only has USB 1.1 ports.

That is not at all typical of the Genesys Logic devices.  Their tendency
is to break when running too fast, and USB 1.1 ports don't seem to drive
them fast enough for that to happen.  Besides, usb-storage includes a time 
delay just to prevent these problems.

Can you post a debugging log from your computer in which you try to use 
the drive after doing "rmmod ehci-hcd"?  Without the ehci-hcd driver 
loaded, the system will fall back to the UHCI controller.

Alan Stern


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