No idea mate.
Have you tried either of the workarounds? Both are pretty easy to maintain and work well if you want to use the drivers.
Matt,
With 15.12,
a) Total War Attila, Charlemagne DLC, when alt tab to windows and go back, whole world breaks lose. Severe flickering, both as screen (between black-colour) and as frequency (vertical black lines). Clock speed goes up but fps stays bellow 10.
b) SWTOR & TESO. The graphics are not rendered properly, and while I have everything maxed out, the textures look like they are bellow the Low setting while on the move. When I stop and give it 1 second, they sort themselves out.
I play those games for years, and never had such issues.
c) The Always 3D clocks, on Asus GPU Tweak, do show on my 295X2 and Windows 7. And if I haven't clicked it, the flickering is severe on all games.
Seriously something is broken after 15.6 & Freesync. Because I never had such issues on screen quality or performance.