DevilKin wrote:
> 
> Hello
> 
> Can someone give me some pointers how to start debugging usb problems?

The question cannot be answered as posed, since it depends on what type of
problem and how clueful you are about USB, C code and hardware design.

There is some guidance in the content on http://www.linux-usb.org, especially
the FAQ (HINT: read the bit on how to report a problem!) and the guide.

Try checking /proc/bus/usb/devices and /proc/bus/usb/drivers to make sure you
have matching entries.

Try turning on debugging options and recompiling.

Try using hardware tools to monitor the line.

Try alternate hardware.

I am sure that this won't really help, but you question is too vague to
provide anything more.

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