fosphor sink block error

[Gwendoline Hochet Derevianckine]

Hello,

I start using Gnuradio (3.7) few months ago under Windows.

Lately, I came up using Gnuradio under Linux Ubuntu 20.04.3 LTS. I was used to use the QT fosphor sink block to see in real time spectrum + waterfall of my signal (example attached).

I'm using an Ettus USRP B200 mini for scanning radio environment around me.

I tried various versions of Gnuradio but fosphor sink block doesn't work under 3.8 or 3.9.

The latest thing I tried is to install Gnuradio 3.7 again but even if I specify PPA repository, the installation result in GnuRadio 3.8.

For my test I use a simple flowgraph : Signal Source -> Throttle -> Qt fosphor sink.

The problem occurs for the visualization: I have a black square in the left top of my screen and the windows appears to be freeze. When I closed it, I have the following error in the GnuRadio terminal:

[!] CL Error (-1001, /build/gr-fosphor-1DVbtt/gr-fosphor-3.8~2.2d4fe78/lib/fosphor/cl.c:299): Unable to fetch platform IDs
[!] No suitable OpenCL device found
gr::log :ERROR: qt_sink_c0 - Failed to initialize fosphor

Is everyone which had the same issue and could solve it ?

If not, is there a block doing the exact same visual output ? I know the QT GUI Sink but visualization is not what I want; it to raw or not enough readable.

Thanks for your help.

Regards,

Gwendoline

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