[Q] debug.composition.type=???

[kirurus]

I have been interested in knowing exactly what this ling does in the build.prop. I have scowered multiple forums with different lines to put in place of the "???" (cpu, gpu, c2d, mdp, dyn).

Anybody know what this line does and what the differnet inputs stand for? I know cpu and gpu, but can't figure out mdp, dyn or c2d (I'm thinking c2d is core 2 duo maybe?)