Problem with OpenCL on latest manjaro

If you run darktable from the command-line with -d opencl -d perf, what do you see? And yes, more details (like the card and the driver, as @piratenpanda mentioned) would be useful to know.

You may find the following topics relevant:
https://discuss.pixls.us/t/opencl-analysis-darktable-much-faster-with-opencl-disabled-something-wrong/