diff --git a/sys/compat/linuxkpi/common/include/linux/backlight.h b/sys/compat/linuxkpi/common/include/linux/backlight.h
--- a/sys/compat/linuxkpi/common/include/linux/backlight.h
+++ b/sys/compat/linuxkpi/common/include/linux/backlight.h
@@ -79,10 +79,10 @@
 	linux_backlight_device_register(name, dev, data, ops, props)
 #define	backlight_device_unregister(bd)	linux_backlight_device_unregister(bd)
 
-static inline void
+static inline int
 backlight_update_status(struct backlight_device *bd)
 {
-	bd->ops->update_status(bd);
+	return (bd->ops->update_status(bd));
 }
 
 static inline void
@@ -91,4 +91,22 @@
 	bd->props.brightness = bd->ops->get_brightness(bd);
 }
 
+static inline int
+backlight_enable(struct backlight_device *bd)
+{
+	if (bd == NULL)
+		return (0);
+	bd->props.power = 0/* FB_BLANK_UNBLANK */;
+	return (backlight_update_status(bd));
+}
+
+static inline int
+backlight_disable(struct backlight_device *bd)
+{
+	if (bd == NULL)
+		return (0);
+	bd->props.power = 4/* FB_BLANK_POWERDOWN */;
+	return (backlight_update_status(bd));
+}
+
 #endif	/* _LINUX_BACKLIGHT_H_ */
diff --git a/sys/compat/linuxkpi/common/src/linux_pci.c b/sys/compat/linuxkpi/common/src/linux_pci.c
--- a/sys/compat/linuxkpi/common/src/linux_pci.c
+++ b/sys/compat/linuxkpi/common/src/linux_pci.c
@@ -1215,6 +1215,8 @@
 
 	pdev->dev.bd->props.brightness = pdev->dev.bd->props.max_brightness *
 		props->brightness / 100;
+	pdev->dev.bd->props.power = props->brightness == 0 ?
+		4/* FB_BLANK_POWERDOWN */ : 0/* FB_BLANK_UNBLANK */;
 	return (pdev->dev.bd->ops->update_status(pdev->dev.bd));
 }