Re: [Discuss-gnuradio] usrp not found until power cycled

[Michael Dickens]

On May 11, 2007, at 4:07 PM, Johnathan Corgan wrote:
> Jiri Pittner wrote:
> > I just obtained a brand new USRP and it seems to work fine (so far  
> > WFM via TVRRX tested),
> > however, after the python script ends, fffe:0002 disappears from  
> > lsusb
> > and gnuradio cannot find the USRP until I cycle the usrp power.
> > I am running gnuradio 3.0.2 on a up-to-date gentoo with 2.6.21  
> > kernel.
>
> This is a known bug in the USRP firmware affecting versions 3.0.3 and
> older when using Linux kernel 2.6.20 and newer.  You can obtain a
> version of GNU Radio with a fix applied by using the Subversion  
> version
> control client as documented:
>
> http://gnuradio.org/trac/wiki/BuildGuide
>
> The stable branch in the repository that you need to check out is:
>
> http://gnuradio.org/svn/gnuradio/branches/releases/3.0

Interestingly, I recently create a VMware VM with Ubuntu Fiesty  
specifically for GNU Radio (and an otherwise identical one with  
Edgy).  I'm using the latest SVN, and it seems to still have this  
issue, or maybe something related to it.  I even added a comment to  
the Ubuntu install guide on the GNU Radio Wiki to that effect, the  
primary reason being that this does not seem necessary with the Edgy  
VM, and thus it's a high probability of this being an issue between  
the newer Linux kernel and the USRP's USB code.

Actually, rebooting doesn't always work either, but more often than  
not it does the trick; seems to have something to do with hot- 
plugging the USRP versus booting up with it already plugged in, at  
least in my testing.

Again, this is with the latest SVN, which includes USB fixes ... I  
can add that the official 3.0.3 release (before the fixes) just  
doesn't work on Fiesty, so the fixes are getting closer to providing  
full ("correct") functionality under the new kernel. - MLD