Re: libusb_get_device_list returning -1?

[Peter S. <pe...@st...>]

Robert Heller wrote:
> OK, I found the problem (although I don't entirely understand it).
> 
> lsusb was getting errno=2 when doing [initialize_device].
> 
> I checked all of the permissions on the /dev/bus/usb tree and everything
> matched exactly on my other machine.
> 
> I then rebooted the problem machine, just to see if that makes any
> difference.  And now everything works correctly!
> 
> The problem machine is a laptop and I generally *suspend* it, rather
> than shut it down.  I just now suspended it and resumed it, but it is
> still working.  I'm guessing there is something wonky somewhere in the
> kernel suspend code and the generic kernel USB driver -- maybe
> something is not being handled properly as part of the suspend/resume
> code, at least over time.

All right. I'm glad that the problem seems to have been resolved,
but in case you run into it again it would be good to diagnose it
further. Please do get in touch again if it comes back.

Thanks!


//Peter