In my experience, I could not for the life of me get opencl working on Linux. Tried drivers from a bunch of different sources, installed and configured different ways … each time, I’d go through a bunch of trouble reinstalling, only to finally end up with the same issue of it just not working ‘no opencl device detected’, etc, etc. Eventually got sick of it and tried an nvidia card instead … which worked perfectly on the first try once I installed nvidia’s drivers.

Granted, that was a few years ago. Maybe the driver software for AMD cards has improved since then. But I’m definitely not going to go out and buy an AMD card just to test if anything has changed – not in this economy!