There is a ticket #16482 (https://dev.haiku-os.org/ticket/16482#no1) and according to this ticket, there is no working for RX460/480 or even 580 only Device ID’s added. This is a needed to do. 
There is a ticket #16482 (https://dev.haiku-os.org/ticket/16482#no1) and according to this ticket, there is no working for RX460/480 or even 580 only Device ID’s added. This is a needed to do.