mmh, I wanted to try sgminer-gm 5.5.5 to see how it compares
but it won't even start working ...

[19:29:08] Initialising kernel ethash.cl with nfactor 10, n 1024
[19:29:15] Error -4: Setting args for the DAG kernel and/or executing it.
[19:29:15] Error: clSetKernelArg of all params failed.
[19:29:15] GPU 0 failure, disabling!

(R9 Nano / Fiji)