mkxminer versions 1.0 - 3.1 were supporting only lyra2rev2 algorithm. But it is now dead for GPU miners, because ASICs completely destroyed lyra2rev2 profitability.
mkxminer version 4.0+ do not support lyra2rev2 anymore. Here is the old lyra2rev2 related thread: https://bitcointalk.org/index.php?topic=2360168