drm/i915: pnv has a backlight polarity control bit, too
We already correctly ignore bit0 on gen < 4, now we also know why ;-) I've decided that losing that single bit of precision isn't worth the trouble to sprinkle IS_PINEVIEW checks all over the backlight control code - that code is way too fragile imo. Reviewed-by: NEugeni Dodonov <eugeni.dodonov@intel.com> Signed-Off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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