Re: Fw: USB ehci problems with USRP, -71 EPROTO

Okay as someone suggested, it was possibly a timing issue.

So, then I thought whats on my bus... and I have a webcam capturing 
images every second with the spca5xx driver.

After stopping the capture and removing the module, it works now!

Greatly appreciate the help.

- George



Alan Stern wrote:
> On Thu, 15 Feb 2007, George Nychis wrote:
> 
>> Oliver Neukum wrote:
>>> Which kernel versions?
>>> Which version of libusb, if that is used?
>> Argh, sorry:
>>    linux-2.6.19
>>    dev-libs/libusb-0.1.12
>>
>>
>>> If you don't do that, does it really work?
>> Not any more, I removed user privileges and it still doesn't work, 
>> however it worked prior to these changes, maybe just by chance?
>>
>>
>>> How are these machines different?
>> They are *exactly* the same in hardware.  Also, we have two of these 
>> USRP devices, neither work on my machine, both work on the other machine.
>>
>>> Also lsusb for your device and full dmesg please.
>> http://www.andrew.cmu.edu/user/gnychis/device
>> http://www.andrew.cmu.edu/user/gnychis/dmesg
> 
> From the dmesg log, it appears that the Python program is sending a 
> message to the device which causes it to crash.  Are you certain that the 
> same programs are running on both machines and are sending the same 
> messages?
> 
> Suggestion: Use usbmon to see the data being sent (instructions in the 
> kernel source file Documentation/usb/usbmon.txt).
> 
> Alan Stern
> 
> 


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