diff --git a/drivers/video/aty/aty128fb.c b/drivers/video/aty/aty128fb.c
index 3e827e0..106d428 100644
--- a/drivers/video/aty/aty128fb.c
+++ b/drivers/video/aty/aty128fb.c
@@ -1800,6 +1800,9 @@
 
 static void aty128_bl_set_power(struct fb_info *info, int power)
 {
+	if (info->bl_dev == NULL)
+		return;
+
 	mutex_lock(&info->bl_mutex);
 	up(&info->bl_dev->sem);
 	info->bl_dev->props->power = power;
@@ -1828,7 +1831,7 @@
 	bd = backlight_device_register(name, par, &aty128_bl_data);
 	if (IS_ERR(bd)) {
 		info->bl_dev = NULL;
-		printk("aty128: Backlight registration failed\n");
+		printk(KERN_WARNING "aty128: Backlight registration failed\n");
 		goto error;
 	}
 
diff --git a/drivers/video/aty/atyfb_base.c b/drivers/video/aty/atyfb_base.c
index 053ff63..510e4ea 100644
--- a/drivers/video/aty/atyfb_base.c
+++ b/drivers/video/aty/atyfb_base.c
@@ -2199,6 +2199,9 @@
 
 static void aty_bl_set_power(struct fb_info *info, int power)
 {
+	if (info->bl_dev == NULL)
+		return;
+
 	mutex_lock(&info->bl_mutex);
 	up(&info->bl_dev->sem);
 	info->bl_dev->props->power = power;
@@ -2223,7 +2226,7 @@
 	bd = backlight_device_register(name, par, &aty_bl_data);
 	if (IS_ERR(bd)) {
 		info->bl_dev = NULL;
-		printk("aty: Backlight registration failed\n");
+		printk(KERN_WARNING "aty: Backlight registration failed\n");
 		goto error;
 	}
 
diff --git a/drivers/video/nvidia/nv_backlight.c b/drivers/video/nvidia/nv_backlight.c
index b45f577..14c37c4 100644
--- a/drivers/video/nvidia/nv_backlight.c
+++ b/drivers/video/nvidia/nv_backlight.c
@@ -112,6 +112,8 @@
 
 void nvidia_bl_set_power(struct fb_info *info, int power)
 {
+	if (info->bl_dev == NULL)
+		return;
 	mutex_lock(&info->bl_mutex);
 	up(&info->bl_dev->sem);
 	info->bl_dev->props->power = power;
@@ -140,7 +142,7 @@
 	bd = backlight_device_register(name, par, &nvidia_bl_data);
 	if (IS_ERR(bd)) {
 		info->bl_dev = NULL;
-		printk("nvidia: Backlight registration failed\n");
+		printk(KERN_WARNING "nvidia: Backlight registration failed\n");
 		goto error;
 	}
 
diff --git a/drivers/video/riva/fbdev.c b/drivers/video/riva/fbdev.c
index 76fc9d3..9036394 100644
--- a/drivers/video/riva/fbdev.c
+++ b/drivers/video/riva/fbdev.c
@@ -354,6 +354,9 @@
 
 static void riva_bl_set_power(struct fb_info *info, int power)
 {
+	if (info->bl_dev == NULL)
+		return;
+
 	mutex_lock(&info->bl_mutex);
 	up(&info->bl_dev->sem);
 	info->bl_dev->props->power = power;
@@ -382,7 +385,7 @@
 	bd = backlight_device_register(name, par, &riva_bl_data);
 	if (IS_ERR(bd)) {
 		info->bl_dev = NULL;
-		printk("riva: Backlight registration failed\n");
+		printk(KERN_WARNING "riva: Backlight registration failed\n");
 		goto error;
 	}