Yes, Darkcoin only (hum, I did not use the SpH miner to mine scrypt, but with other miners, no problem), R9 290 only.
Since darkcoin is no scrypt, whats the matter?
Or do you mean: you are only mining darkcoin with sph-sgminer?
Would be nice to test scrypt with sgminer.
Kernels should be the same, pls give it a try!