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Peter A. Bigot pab at pabigot.comOn 02/12/2013 01:34 PM, Markus Gonser wrote: > Hello, > > I am new to this mailing list, but that does not mean that I have been > following SDR activities here at osmocom and especially gnuradio > actively. I am not a linux professional, but "intermediate beginner". > I currently have a problem running my Hama Nano DVB-T Dongle which I > cannot solve and therefore need to turn to you with the following problem: > > I hava an Intel Pentium 977 machine running Ubuntu 12.04LTS in the > 64bit version. I compiled and installed gnuradio using the script from > Marcus Leech (http://www.sbrac.org/files/build-gnuradio) > > I have an Hama Nano DVB-T Dongle which contains an RTL2832U Chip > combined with the E4000 frontend. > > When I try to access the Dongle via rtlsdr (either via sample programs > in GRC or simply via rtl_test -s) I get > > cb transfer status: 1, canceling... > > Library error 0, exiting... > Speicherzugriffsfehler (Speicherabzug geschrieben) (engl.: > "segmentation fault") > > I found two threads regarding this problem in this mailinglist: > 1) http://lists.osmocom.org/pipermail/osmocom-sdr/2013-January/000443.html > 2) http://lists.gnumonks.org/pipermail/osmocom-sdr/2012-August/000201.html > > With respect to the former (1) I checked my version of > libusb-1.0-0-dev which is 2:1.0.9~rc3-2ubuntu1 > With respect to the latter (2) (and older post) I checked in my source > of the rtlsdr library if the proposed change is included and it is. > > So I do not have any clue how and where to proceed further. I'd be > happy to give you any more information you need and try out patches. > If you have any ideas or could point me to the right direction, I'd be > very happy about > > Thanks upfront for your consideration and best regards, > > Markus > > P.S.: The dongle worked on this machine before, but I do not remember > if I had the 32bit Ubuntu version running and which versions of > gnuradio, etc. were installed. My conclusion from thread (1), based on the response from Peter Stuge, was that rtl-sdr was mis-using libusb by closing the device without waiting for it to finish, and it's not a fault in libusb. Looks like git://git.osmocom.org/osmo-sdr is down, and the cgit browser is out of date, so I can't tell what's been done since. But the fix needs to be made in rtl-sdr, whether it's reverting the patch as I suggested or correcting it to wait before shutting things down. Peter -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/osmocom-sdr/attachments/20130212/c9492863/attachment.htm>