Certainly your driver don’t appear to be the latest, 390.59 is in Debian, 390.48 in Bionic, 390.67 in Cosmic. If you are on 384.130 then does that does look like the shipped driver which came with Artful (17.10). Does that also mean GIMP 2.8.20? You should certainly be on GIMP 2.10 to consider testing OpenCL through GEGL, as that will also mean the more recent GEGL 0.4.0.
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