[Discuss-gnuradio] RTL SDR & GNU Radio new linux machine.

[duane]

Hi,

I just built Gnu Radio from source on a new/fresh linux machine (Ubuntu
16)

For some reason, my RTL-SDR device cannot be opened.

I get this error:

usb_claim_interface error -6

1) The device is present, it shows in dmesg

2) I do not think it is a udev permissions error - 
a) the rules are installed in /dev/udev/rules.d/15-rtl-sdr.rules
b) Running GnuRadio as ROOT - has the same result.

3) Also Running any of the RTL tool commands have the same errors.

tried this: http://gnuradio.org/redmine/issues/659 - become root as
workaround - does not help

4) I do see the device:  /dev/swradio0 - show up

5) DMESG output is below

My hunch is this:
   Something is grabbing the interface
   And that is stopping GNU radio from using it.

Sort of stuck.... Any suggestions?

========================
address@hidden:~$ dmesg
[ 1390.155412] usb 3-7: new high-speed USB device number 14 using
xhci_hcd
[ 1390.351122] usb 3-7: New USB device found, idVendor=0bda,
idProduct=2838
[ 1390.351132] usb 3-7: New USB device strings: Mfr=1, Product=2,
SerialNumber=3
[ 1390.351138] usb 3-7: Product: RTL2838UHIDIR
[ 1390.351144] usb 3-7: Manufacturer: Realtek
[ 1390.351149] usb 3-7: SerialNumber: 00000001
[ 1390.358518] usb 3-7: dvb_usb_v2: found a 'Realtek RTL2832U reference
design' in warm state
[ 1390.411917] usb 3-7: dvb_usb_v2: will pass the complete MPEG2
transport stream to the software demuxer
[ 1390.411928] DVB: registering new adapter (Realtek RTL2832U reference
design)
[ 1390.415941] i2c i2c-6: Added multiplexed i2c bus 7
[ 1390.415945] rtl2832 6-0010: Realtek RTL2832 successfully attached
[ 1390.415950] usb 3-7: DVB: registering adapter 0 frontend 0 (Realtek
RTL2832 (DVB-T))...
[ 1390.416003] r820t 7-001a: creating new instance
[ 1390.427516] r820t 7-001a: Rafael Micro r820t successfully identified
[ 1390.428198] rtl2832_sdr rtl2832_sdr.1.auto: Registered as swradio0
[ 1390.428211] rtl2832_sdr rtl2832_sdr.1.auto: Realtek RTL2832 SDR
attached
[ 1390.428212] rtl2832_sdr rtl2832_sdr.1.auto: SDR API is still slightly
experimental and functionality changes may follow
[ 1390.434674] Registered IR keymap rc-empty
[ 1390.434714] input: Realtek RTL2832U reference design as
/devices/pci0000:00/0000:00:14.0/usb3/3-7/rc/rc0/input26
[ 1390.434794] rc0: Realtek RTL2832U reference design as
/devices/pci0000:00/0000:00:14.0/usb3/3-7/rc/rc0
[ 1390.435000] rc rc0: lirc_dev: driver ir-lirc-codec (dvb_usb_rtl28xxu)
registered at minor = 0
[ 1390.435044] input: MCE IR Keyboard/Mouse (dvb_usb_rtl28xxu) as
/devices/virtual/input/input27
[ 1390.435158] usb 3-7: dvb_usb_v2: schedule remote query interval to
200 msecs
[ 1390.451269] usb 3-7: dvb_usb_v2: 'Realtek RTL2832U reference design'
successfully initialized and connected
address@hidden:~$ lf /dev/swradio0 
crw-rw-rw-+ 1 root video 81, 0 Oct 23 16:29 /dev/swradio0
address@hidden:~$ 
========================

-Duane.