my laptop does support Dual Graphics, but it works horrible. If you want to know it exactly, it doesn't work. Either the game isn't even enabling Dual Graphics ( Crysis 3, BF4, Metro etc) or Dual Graphics is a stuttery mess and not playable at all (Sleeping Dogs, 3DMark) Allthough it gains A LOT of a better score in 3D Mark (1900 to 2800) but the displayed image is still a stuttery mess.
Of course I tried to apply the good crossfire profile of 3DMark to the games which aren't enabling Dual Graphics, but then it's a stuttery mess too, goes from 28 FPS to 40 FPS in seconds and back (30 stable FPS with HD 8750m alone)
So basically I can't use Dual Graphics at all even though it has a great potential. I know Dual Graphics between two different architecture is a bit complex but c'mon it's a praised feature from AMD and I want to usw it. Don't get me wrong I'm happy with the power that my dedicated 8750m delivers but if there's such a great improvement, why not optimize it so I can take advantage from it? And my integrated APU is not bad at all at gaming so... see what I'm saying?