Is there any way to support Hawaii cards (ie: R9 270x 2GB)?
I haven't had much luck finding a linux-based miner that can play nicely with these older cards
SRBMiner-MULTI, PhoenixMiner, GMiner they work at least with my R9 390 8GB and RX 580 8GB cards. Probably there are more but I know for sure these miners work.
TRM I must say did work with my R9 390 but I switched to PhoenixMiner.
But your R9 270x 2GB is way to old to be profitable anyway.
LolMiner works just fine with these cards, as well. I'm running two HD7950s with LolMiner doing 20-25 MH/s @ ETC.