Re: [Discuss-gnuradio] B200mini USB 3.0 Detection Issues

[Chris Kuethe]

I'm going to guess the root cause is power:
- I recently heard some folks wishing for an external power connector
for their minis due to power issues.
- My B200 will brown out on a 6ft cable, and usually works fine on the 3ft
- My laptop will switch from charging to discharging when I push the B200 hard
- My laptop often fails to negotiate USB3 when on batteries, falling
back to USB2
- Powering my B200 with an external supply makes all of these issues go away.

Also, you can just use uhd_usrp_probe to load the firmware and test
the connection... might be a little bit quicker than using
gnuradio-companion.

On Fri, Feb 5, 2016 at 11:34 AM, Marcus D. Leech <address@hidden> wrote:
> On 02/05/2016 01:40 PM, Michael Skaggs wrote:
>>
>> Hello,
>>
>> I recently started working with the Ettus B200mini board in GNU Radio and
>> I appear to be having issues with the detection of USB 3.0. The system I am
>> working on is a Dell Latitude E6530 with Ubuntu 14.04. I just yesterday
>> updated to the latest version of GNU Radio and UHD by running the
>> build-gnuradio script.
>>
>> The issue I am having is when I plug the B200mini into one of the USB 3.0
>> ports, it is only detected by GNU Radio Companion as USB 3.0 maybe 1 out of
>> 20 times I plug it in, sometimes less often. When it detects as USB 3.0 it
>> is a full speed connection with no issues, when detected at USB 2.0, it is
>> much slower, but appears to work fine.
>>
>> I am almost 100% certain this is an issue with the B200mini only. I have
>> two of the boards with two different cables, both of them have the detection
>> issue. I also have tried using a B210 multiple times on the laptop with no
>> issues. The B210 never once detected as USB 2.0 when I plugged it in and
>> programmed it through GRC. "lsusb" also detects the USB 3.0 root hub every
>> single time.
>>
>> Does anyone have any idea what might be going on?
>>
>> Thanks in advance,
>> Michael
>>
> Do you know what type of USB-3.0 controller you have on the laptop?   Have
> you tried on another computer?
>
>
>
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-- 
GDB has a 'break' feature; why doesn't it have 'fix' too?