Hi folks, something wasn't quite right with current git master of rtl-sdr, since it wouldn't detect the Fitipower FC0012 tuner on a couple (dozen) of my dongles. So, I had a quick git-bisect session that basically went: git checkout master git bisect start [build] [connect dongle] build/src/rtl_eeprom | grep "Found Fitipower" then git bisect good else git bisect bad [disconnect dongle] jump back to build, rinse, repeat turns out, when you _initialize_ the dongle with an older version, it works, even with the newer revisions (hence my un- and replugging exercises). The (reproducibly) offending commit is the GPO/GPD register swap in ba64a74 : librtlsdr.c, l. 570, - rtlsdr_write_reg(dev, SYSB, GPO, r & ~gpio, 1); + rtlsdr_write_reg(dev, SYSB, GPD, r & ~gpio, 1); Now, that commit's msg mentions http://lea.hamradio.si/~s57uuu/mischam/rtlsdr/ports.html and I don't want to break their application, but I can't get my dongles to run :( How to proceed from here? I'm not quite sure what I'd break if I just reverted that commit; _my_ R820T dongle continues to work if I revert, but I'm sure this commit didn't come out of thin air. Best regards, Marcus