I'm running Inkscape 0.92.4 on Ubuntu Linux 19.10. My graphics driver is from NVidia. I'm given to believe that Inkscape's filters should work and render fairly similarly to how filters work in GIMP. My expectations are based on this image which shows various filter effects which ship with Inkscape:
However, when I apply filters to even very simple shapes, I get horrible pixelated garbage like this:
Can anyone help me understand what is wrong and how to correct it? Thanks!