[Hackrf-dev] And I can't make work 2 hackrf boards in GRC

[Leandro Leoncini]

  The problem persist when I try to run some GRC python scripts so I'm goin
to check the USB power as Dominic suggest.

2016-03-03 10:47 GMT-03:00 Dominic Spill <dominicgs at gmail.com>:

> On 3 March 2016 at 01:45, Leandro Leoncini <leoncini at gmail.com> wrote:
> >   Hi, I can't make work 2 hackrf at the same time in GRC. Both devices
> work
> > well one at the time but not at the same time. When both are connected I
> can
> > see them in hackrf_info:
> >
> > hackrf_info
> > Found HackRF board 0:
> > USB descriptor string: 0000000000000000321864c83940521d
> > Board ID Number: 2 (HackRF One)
> > Firmware Version: 2015.07.2
> > Part ID Number: 0xa000cb3c 0x00624735
> > Serial Number: 0x00000000 0x00000000 0x321864c8 0x3940521d
> >
> > Found HackRF board 1:
> > USB descriptor string: 000000000000000014d463dc2f8e9ce1
> > Board ID Number: 2 (HackRF One)
> > Firmware Version: 2015.07.2
> > Part ID Number: 0xa000cb3c 0x0068475a
> > Serial Number: 0x00000000 0x00000000 0x14d463dc 0x2f8e9ce1
> >
> >
> >   But when I start using one of them in GRC this is what I get:
> >
> > hackrf_info
> > Found HackRF board 0:
> > USB descriptor string: 0000000000000000321864c83940521d
> > hackrf_open() failed: HACKRF_ERROR_LIBUSB (-1000)
>
> This doesn't look like the kernel's SDR driver because it at least
> works once.  Assuming you're running HackRF tools 2015.07.2 (and the
> fact that you're seeing serial numbers in the hackrf_info output
> suggests you are), libHackRF will be unloading the kernel driver for
> you.
>
> >   I'm on Linux Mint 17.3 with GRC 3.7.9.1 so any idea of what can be the
> > problem?
>
> This looks a lot like a power management issue to me.  The USB stack
> on HackRF doesn't yet support suspend mode, which wasn't a problem
> until distros recently started using it.
>
> The short term fix for this is to blacklist the device from power
> saving.  If you have a file called /etc/default/tlp on your system,
> add the following line:
> USB_BLACKLIST="1d50:6089 1d50:604b 1d50:cc15 1d50:60e6"
>
> If Mint is using laptop-mode instead, you'll find a directory called
> /etc/laptop-mode/conf.d/ in to which you should place a file called
> hackrf.conf with the following:
> AUTOSUSPEND_USBID_BLACKLIST="1d50:604b"
> AUTOSUSPEND_USBID_BLACKLIST="1d50:cc15"
> AUTOSUSPEND_USBID_BLACKLIST="1d50:6089"
>
> Let me know if this solves the problem for you.  I hope to find a way
> to fix this more permanently in future.
>
> Dominic
>
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