diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 90f8f76..a9eec8c 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -795,6 +795,7 @@
 		count++;
 
 		memset(&props, 0, sizeof(struct backlight_properties));
+		props.type = BACKLIGHT_FIRMWARE;
 		props.max_brightness = device->brightness->count - 3;
 		device->backlight = backlight_device_register(name, NULL, device,
 							      &acpi_backlight_ops,