Alan Stern wrote:
Okay. It's clear that you've got a hardware problem of some sort.
Hard to say what it is, but evidently the EHCI controller thinks that
the device is repeatedly being unplugged and replugged.
Anyway, this isn't a problem of recognizing that a single device is
having problems. In fact the computer has no way of knowing that a
single device is involved; all it knows is that _something_ gets
plugged into the port and then removed. There's no way to tell if it's
the same _something_ from one iteration to the next.
You can manually force the port to run at full speed instead of high
speed as follows:
echo '4' >/sys/class/usb_host/usb_host4/companion
The "companion" attribute file contains a list of ports which are
permanently set to be handled by the EHCI's companion controller. To
return to high-speed operation, use '-4' instead of '4' above. This
might or might not solve your problem -- the hardware bug might cause
the port to return automatically to high-speed regardless.
Let me know what happens.
Alan Stern
Yes that works.
I tried to plug and unplug the device repeatedly and each time it came
up in full-speed mode.
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