backlight_unregister_notifier  454 drivers/acpi/video_detect.c 		backlight_unregister_notifier(&backlight_nb);
backlight_unregister_notifier  512 drivers/video/backlight/backlight.c EXPORT_SYMBOL(backlight_unregister_notifier);
backlight_unregister_notifier  191 include/linux/backlight.h extern int backlight_unregister_notifier(struct notifier_block *nb);