[Discuss-gnuradio] Re: [linux-usb-devel] Fw: USB ehci problems with USRP, -71 EPROTO

[George Nychis]

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