joma Posted May 2, 2016 Posted May 2, 2016 Hi, After today upgrade (Kernel / Firmware) my DVB-T pen stop working with dump1090. Error message: /usr/bin/dump1090 --net --gain -10 --modeac --net-bo-port 30005 --net-bi-port 30104 Found 1 device(s): 0: Realtek, RTL2838UHIDIR, SN: 00000001 (currently selected) Kernel driver is active, or device is claimed by second instance of librtlsdr. In the first case, please either detach or blacklist the kernel module (dvb_usb_rtl28xxu), or enable automatic detaching at compile time. usb_claim_interface error -6 Error opening the RTLSDR device: Device or resource busy I tried to follow this tip: http://discussions.flightaware.com/ads-b-flight-tracking-f21/dump1090-not-displaying-data-t19996.htmlwithout results. It's possible to revert the upgrade? Thanks in Advance. Jorge Mota Orange PI PC Jessie 3.4.112-sun8i
Igor Posted May 3, 2016 Posted May 3, 2016 You can use older kernel but it's recommended that this is fixed within this kernel - use self compiled driver until then. It should go.
giacomo892 Posted May 3, 2016 Posted May 3, 2016 Hi, After today upgrade (Kernel / Firmware) my DVB-T pen stop working with dump1090. Error message: /usr/bin/dump1090 --net --gain -10 --modeac --net-bo-port 30005 --net-bi-port 30104 Found 1 device(s): 0: Realtek, RTL2838UHIDIR, SN: 00000001 (currently selected) Kernel driver is active, or device is claimed by second instance of librtlsdr. In the first case, please either detach or blacklist the kernel module (dvb_usb_rtl28xxu), or enable automatic detaching at compile time. usb_claim_interface error -6 Error opening the RTLSDR device: Device or resource busy I tried to follow this tip: http://discussions.flightaware.com/ads-b-flight-tracking-f21/dump1090-not-displaying-data-t19996.htmlwithout results. It's possible to revert the upgrade? Thanks in Advance. Jorge Mota Orange PI PC Jessie 3.4.112-sun8i Hi! Had the same issue after upgrade! Really easy to solve: Edit /etc/modprobe.d/rtl-sdr-blacklist.conf and add: blacklist dvb_usb_rtl2832u Then reboot
Ford Prefect Posted June 22, 2016 Posted June 22, 2016 Hi I'm trying to get gqrx-sdr to work with my RTL 2832 DVBT dongle. In spite of having the driver blacklisted it loads at start up but can be easily removed by rmmod dvb_usb_rtl2832u as root No need to reboot and TV applications can use the dongle normally Then you have to install pulse audio for an unknown reason Here the strange behaviour begins: At start the sound on an FM station is very poor. Only bits of sound in fact. On a text console running Armbian monitor -m shows lots of fall back to 480MHz although my well cooled CPU is around 30 degrees waiting about 10 minutes it gets perfect temperature rises to 45 and CPU clock stays at 1296 MHz But waiting more the sound gets bad again at times. htop shows that pulse audio is using a rather big % of CPU The only other OS that allows me to use gqrx on my OPI PC is XFCE Kali. There CPU frequency is steady at 1540 MHz temperature is higher and pulse audio use less CPU . I managed to get a fixed 1296MHz CPU frequency by putting GOVERNOR =performance in /etc/default/cpufrequtils It changes absolutely nothing So I believe my problems are due to pulseaudio which seems rather complicated May be a fifo written at 44Khz and read at 48 or the opposite. Any idea is welcome Edit : Partial success I plugged a pair of USB speakers It is OK So the problem seems to be somewhere between pulse audio and HDMI sound. Now the CPU temperature rise to 54 degrees and it makes me happy because since I used Armbian I thought that the big radiator I put on the CPU was useless 1
Seasalt Posted June 23, 2016 Posted June 23, 2016 Hi I'm trying to get gqrx-sdr to work with my RTL 2832 DVBT dongle. Could you put up a bit more information on how you are going, getting GQRX working. Is it worth trying to do or is GQRX such a CPU intensive app it wont work effectively on a H3 processor. I am very interested in any HAM related uses for my Orange Pi's.
Ford Prefect Posted June 23, 2016 Posted June 23, 2016 The problem when I first installed gqrx-sdr on my Armbian OPI PC is that it crashed Starting it from a console there was a brief obscure allusion to pulseaudio and a lot of messages :could not resolve property : pattern 10600 Those are not important at all. The pulseaudio one is as it appears that Debian uses that by default and it is not used in Armbian So you have to install it too. Next problem is that if you want to use an RTL2832 dongle you get a message saying that it is not available . This is because Armbian loads the TV driver but you just have to type as root rmmod dvb_usb_rtl2832u I could not manage to get a correct audio on the HDMI but with either an USB speaker or the analog audio output it works nice. You may have to use a mixer in case the volume is muted. GQRX can be quite CPU intensive if you try for example to view 2MHz while demodulating an FM stereo signal. I won't recommend using it without good cooling of the CPU. In that case the sound gets bad and the launching console fills with zeros. But it doesn't crash and stays reactive so you can correct parameters. One interesting feature is that you can select Demod Off then CPU use is much lower than in FM stereo To load back: the TV driver for the dongle : modprobe dvb_usb_rtl2832u Or simply unplug it and plug it again. I have tried with success : A Funcube dongle pro An RTL dongle with E4000 tuner An RTL dongle with R820 tuner Forum for GQRX: https://groups.google.com/forum/#!forum/gqrx PS : The gqrx forum recommends to run volk_profile. Don't It takes a long time and then nothing works any more You have to delete/hide/rename the .volk dirctory in your home.
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