This started to happen with some beta drivers that launched around October or something, since than its still not fixed.
If i install some older drivers it works just fine.
If i untick "enable unified...." it does show % usage but its very inaccurate, with it enabled it just shows 0% usage in all games
ps: If i untick that option the gpu usage does work but its very innacurate...If i enable it shows 0% usage in all games