BACKLIGHT_DUTY_CYCLE_SHIFT  103 drivers/gpu/drm/gma500/psb_intel_reg.h #define BACKLIGHT_DUTY_CYCLE_SHIFT	(0)
BACKLIGHT_DUTY_CYCLE_SHIFT 4865 drivers/gpu/drm/i915/i915_reg.h #define   BACKLIGHT_DUTY_CYCLE_SHIFT		(0)