drm/i915: add fbc enable flag, but disable by default
FBC has too many corner cases that we don't currently deal with, so disable it by default so we can enable more important features like RC6, which conflicts in some configurations. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=31742Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org> Reviewed-by: NBen Widawsky <ben@bwidawsk.net> Signed-off-by: NKeith Packard <keithp@keithp.com>
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