backlight_nb 44 drivers/acpi/video_detect.c static struct notifier_block backlight_nb; backlight_nb 413 drivers/acpi/video_detect.c backlight_nb.notifier_call = acpi_video_backlight_notify; backlight_nb 414 drivers/acpi/video_detect.c backlight_nb.priority = 0; backlight_nb 415 drivers/acpi/video_detect.c if (backlight_register_notifier(&backlight_nb) == 0) backlight_nb 454 drivers/acpi/video_detect.c backlight_unregister_notifier(&backlight_nb);