I just tested quickly on an example from dpreview and everything seems to work here. Are you building ART yourself? If so, did you try with the “official” linux binary?
Hello @mervinbeng
I have had exactly this camera for almost a year. Before I bought it, Alberto “did” something in ART so that these RW2s could be processed. Since then, everything has been running smoothly with ART and the Panasonic S5M2.