Hi Ian,

On 2023-04-21 13:09 +0100, Ian Chodera wrote:
> I have a problem using a B200-mini on a Ubuntu 20.04 machine
> 
> The device is recognised on the USB bus
> 
> >lsusb
> Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> Bus 001 Device 008: ID 2500:0021 Ettus Research LLC USRP B200-mini
> Bus 001 Device 006: ID 10c4:ea60 Silicon Labs CP210x UART Bridge
> 
> But not using uhd_find_devices (or uhd_usrp_probe)
[...]
> The fpga and firmware images on the machine appear to be up-to date (using. 
> uhd_images_downloader)
> 
> 
> I have confirmed that the B200-mini works by plugging it into another 
> computer (a Mac) - here is the output from uhd_find_devices on that machine
> 
> [INFO] [UHD] Mac OS; Clang version 14.0.0 (clang-1400.0.29.202); 
> Boost_108100; UHD_4.4.0.0-47-gd18647dd
> [INFO] [B200] Loading firmware image: 
> /opt/local/share/uhd/images/usrp_b200_fw.hex...
> --------------------------------------------------
> -- UHD Device 0
> --------------------------------------------------
> Device Address:
>     serial: 31E21E3
>     name: B200mini
>     product: B200mini
>     type: b200
> 
> 
> What could be wrong on the Ubuntu machine - and how can I fix it?

If uhd_find_devices works under the root user,
then it might be an issue with missing udev rules.
You can find the procedure there:
https://files.ettus.com/manual/page_transport.html#transport_usb_udev

Best regards
-- 

Cédric Hannotier
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