BACKLIGHT_DUTY_CYCLE_MASK  104 drivers/gpu/drm/gma500/psb_intel_reg.h #define BACKLIGHT_DUTY_CYCLE_MASK	(0xffff)
BACKLIGHT_DUTY_CYCLE_MASK 4866 drivers/gpu/drm/i915/i915_reg.h #define   BACKLIGHT_DUTY_CYCLE_MASK		(0xffff)