Strictly speaking:
debug.composition.7x27A.type=mdp
doesn't actually do anything. Its value is used in a composition type script. The value is set as debug.composition.type too (based on the platform - debug.composition.*plat*.type), which is what actually controls the display HAL.
debug.sf.hw=1 doesn't do anything either. Its value is default anyway. Gotta love a bit of placebo though.
You're getting confused between MDP composition and hardware accelerated UI. I'm fairly sure the latter will never fully exist on stock ROMs.
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