Really vague reply coming. FWIR on Debian, in the repository, the drivers for the 4* class were shifted out of the Catalyst driver and into a legacy driver of sorts. It isn't as bad as the nVidia schmozzle, but there was a split
My apologies, but I can not rember the details. Apart from my 7790, my only other AMD card is a very old AGP card or an ancient AT/XT cards.