> Hi all
>
> I have a problem with the WX slider freezing when I'm also displaying
> a FFT sink. This is on Ubuntu Linux 18.04 LTS.
>
> For some background, (sorry if this is a bit long and vague). I'm new
> to GNU Radio. I'm working through Michael Ossmann's video course. I
> only have a cheap dongle SDR but I've managed to get it receiving the
> FM broadcast stations nicely. I'm eagerly waiting for my preordered
> Airspy HF+ Discovery.
>
> I'm running on an HP Pavilion laptop. It's a few years old but I think
> it's still not too bad. I7 quad core (htop shows 8 cpus because of
> hyperthreading), 8 GB ram.
>
> Following Michael's course, I'm using WX widgets. The sliders are
> often frozen. If I slide the mouse back and forward then the numeric
> value changes but the pointer doesn't move. When I release the mouse
> the value returns to the default. This happens with a simple1 kHz
> waveform generator, to a throttle block to an FFT sink with 32k sample
> rate. Occasionally they start working. I think a slider always works
> if it's the only widget.
>
> Another issue is that it really doesn't work well with the sound at
> 48kHz. Lots of underflows and sounds distorted. It works reasonably
> well on 44.1kHz.
>
> One of the exercises on the course is to try Pentoo Linux. I made a
> live usb stick of Pentoo and the FM radio receiver flow works
> perfectly with sliders working smoothly and sounding good at 48kHz
> without underflow or overflow. I don't really want to use Pentoo as my
> primary O/S. I'm not sure if it's activity maintained.
>
> As an experiment, I made live usb sticks for several Ubuntu flavors.
> Ubuntu 18.04 LTS to check if maybe something wrong with my main
> install but got the same result.
> Xubuntu - Same result.
> Kubuntu - Sliders work well but same issue with the sound.
>
> All this is with GNU radio 3.7.11-10 installed with apt-get.
>
> I'd appreciate any suggestions. Maybe it's just not good hardware for
> this but maybe it's something simple. I don't know enough about
> desktop Linux to know what makes Pentoo work so well compared to the
> others.
>
> Thanks
One of the reasons that Wx is deprecated is that its performance and
thread-management are less-than-wonderful, and some of the
underlying libraries haven't been maintained in many years by the
WxGui authors.
We now strongly recommend Qt instead, and Wx is going away entirely in
Gnu Radio 3.8.
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