USRP B200mini Does Not Work in Gnu Radio With Latest Version of Linux Mint (21.2)

[Gary Schafer]

I just upgraded my system from Linux Mint 21.1 to 21.2. My system is an Intel i7-6700 
based desktop with 32 GB of RAM. After loading the OS and going through my usual routine 
of loading programs and drivers, I discovered that I cannot use my USRP B200mini. I tried 
running a basic Gnu Radio flowgraph of USRP source to a frequency sink as a quick test. 
Right after I started it, it stopped with the statement, "Done (return 
code-11)". I'm not certain if this is a Gnu Radio problem, Mint problem, or USRP 
problem. I *suspect* it's a Mint / USRP problem. I've loaded libuhd4.1.0 as well as 
libuhd-dev and uhd-host. Normally, that's all that is required.

When I run "uhd_find_devices", I get:

[INFO] [UHD] linux; GNU C++ version 11.2.0; Boost_107400; UHD_4.1.0.5-3
--------------------------------------------------
-- UHD Device 0
--------------------------------------------------
Device Address:
    serial: 11160936550978964554
    default_input: False
    default_output: False
    device_id: 4
    driver: audio
    label: Monitor of GM204 High Definition Audio Controller Digital Stereo 
(HDMI 3)
    type: soapy

--------------------------------------------------
-- UHD Device 1
--------------------------------------------------
Device Address:
    serial: 12015008079946540021
    default_input: True
    default_output: False
    device_id: 0
    driver: audio
    label: C922 Pro Stream Webcam Analog Stereo
    type: soapy

--------------------------------------------------
-- UHD Device 2
--------------------------------------------------
Device Address:
    serial: 13719246102091647219
    default_input: False
    default_output: False
    device_id: 3
    driver: audio
    label: Monitor of Built-in Audio Analog Stereo
    type: soapy

--------------------------------------------------
-- UHD Device 3
--------------------------------------------------
Device Address:
    serial: 3279479
    name: B200mini
    product: B200mini
    type: b200

Further, when I run uhd_usrp_probe, I get the following:

INFO] [UHD] linux; GNU C++ version 11.2.0; Boost_107400; UHD_4.1.0.5-3
  _____________________________________________________
 /
|       Device: Audio
|     _____________________________________________________
|    /
|   |       Mboard: Audio
|   |   device_id: 0
|   |   origin: https://github.com/pothosware/SoapyAudio
|   |
|   |   Time sources:
|   |   Clock sources:
|   |   Sensors:
|   |     _____________________________________________________
|   |    /
|   |   |       RX DSP: 0
|   |   |
|   |   |   Freq range: 0.000 to 0.000 MHz
|   |     _____________________________________________________
|   |    /
|   |   |       RX Dboard: 0
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       RX Frontend: 0
|   |   |   |   Name: SoapyRF
|   |   |   |   Antennas: RX
|   |   |   |   Sensors:
|   |   |   |   Freq range: 0.000 to 6000.000 MHz
|   |   |   |   Gain Elements: None
|   |   |   |   Bandwidth range: 0.0 to 0.0 step 0.0 Hz
|   |   |   |   Connection Type: IQ
|   |   |   |   Uses LO offset: No
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       RX Codec: 0
|   |   |   |   Name: SoapyADC
|   |   |   |   Gain Elements: None
|   |     _____________________________________________________
|   |    /
|   |   |       TX DSP: 0
|   |   |
|   |   |   Freq range: 0.000 to 0.000 MHz
|   |     _____________________________________________________
|   |    /
|   |   |       TX Dboard: 0
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       TX Frontend: 0
|   |   |   |   Name: None
|   |   |   |   Antennas:
|   |   |   |   Sensors:
|   |   |   |   Freq range: 0.000 to 0.000 MHz
|   |   |   |   Gain Elements: None
|   |   |   |   Bandwidth range: 0.0 to 0.0 step 0.0 Hz
|   |   |   |   Connection Type: IQ
|   |   |   |   Uses LO offset: No
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       TX Codec: 0
|   |   |   |   Name: None
|   |   |   |   Gain Elements: None

This does not seem correct. For example, when running the same command on 
another system still running 21.1, I get much more detailed information about 
the B200mini. (It also says that it is loading a firmware image right after 
starting the command, which does not happen here.)

If anyone has any ideas, I'm all ears.

Thanks,

Gary