drm/i915: FBC off for ironlake and older, otherwise on by default
Make the default FBC behaviour chipset specific, allowing us to turn it on by default for Ironlake and older where it has been seen to cause trouble with screen updates. Signed-off-by: NKeith Packard <keithp@keithp.com> Tested-by: NFrancis Moreau <francis.moro@gmail.com>
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