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by nextparadigms 5350 days ago
It's actually enabled by default on Android 4.0. It's optional only in Honeycomb.
1 comments

It depends on your targetSdk. It can't be enabled by default because it breaks a lot of apps.
You're currently downvoted, but you're correct. Apps targetting older sdks will need to opt-in to make use of the acceleration, even on ICS. But it's an easy switch to flip, assuming it doesn't cause visual glitches, which it can in some cases.