diff --git a/drivers/acpi/asus_acpi.c b/drivers/acpi/asus_acpi.c
index bfae3ffff13c..7cc54aacd4c0 100644
--- a/drivers/acpi/asus_acpi.c
+++ b/drivers/acpi/asus_acpi.c
@@ -1401,7 +1401,7 @@ static int __init asus_acpi_init(void)
 		return result;
 	}
 
-	asus_backlight_device = backlight_device_register("asus", NULL,
+	asus_backlight_device = backlight_device_register("asus",NULL,NULL,
 							  &asus_backlight_data);
         if (IS_ERR(asus_backlight_device)) {
 		printk(KERN_ERR "Could not register asus backlight device\n");
diff --git a/drivers/acpi/ibm_acpi.c b/drivers/acpi/ibm_acpi.c
index 1e7abef404b0..130cc8c37e22 100644
--- a/drivers/acpi/ibm_acpi.c
+++ b/drivers/acpi/ibm_acpi.c
@@ -1714,7 +1714,7 @@ static struct backlight_properties ibm_backlight_data = {
 
 static int brightness_init(void)
 {
-	ibm_backlight_device = backlight_device_register("ibm", NULL,
+	ibm_backlight_device = backlight_device_register("ibm", NULL, NULL,
 							 &ibm_backlight_data);
 	if (IS_ERR(ibm_backlight_device)) {
 		printk(IBM_ERR "Could not register backlight device\n");
@@ -2503,7 +2503,7 @@ static int __init setup_notify(struct ibm_struct *ibm)
 		       ibm->name, status);
 		return -ENODEV;
 	}
-
+	ibm->notify_installed = 1;
 	return 0;
 }
 
@@ -2580,7 +2580,6 @@ static int __init ibm_init(struct ibm_struct *ibm)
 		ret = setup_notify(ibm);
 		if (ret < 0)
 			return ret;
-		ibm->notify_installed = 1;
 	}
 
 	return 0;
diff --git a/drivers/acpi/toshiba_acpi.c b/drivers/acpi/toshiba_acpi.c
index 2f35f891593f..88aeccbafaaf 100644
--- a/drivers/acpi/toshiba_acpi.c
+++ b/drivers/acpi/toshiba_acpi.c
@@ -590,7 +590,8 @@ static int __init toshiba_acpi_init(void)
 			remove_proc_entry(PROC_TOSHIBA, acpi_root_dir);
 	}
 
-	toshiba_backlight_device = backlight_device_register("toshiba", NULL,
+	toshiba_backlight_device = backlight_device_register("toshiba",NULL,
+						NULL,
 						&toshiba_backlight_data);
         if (IS_ERR(toshiba_backlight_device)) {
 		printk(KERN_ERR "Could not register toshiba backlight device\n");
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 53a9eb015d6b..eb5141f9ef8f 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -3,6 +3,7 @@
  *
  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
+ *  Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
  *
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  *
@@ -47,11 +48,11 @@
 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT	0x83
 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT	0x84
 
-#define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS	0x82
-#define	ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS	0x83
-#define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS	0x84
-#define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS	0x85
-#define ACPI_VIDEO_NOTIFY_DISPLAY_OFF		0x86
+#define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS	0x85
+#define	ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS	0x86
+#define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS	0x87
+#define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS	0x88
+#define ACPI_VIDEO_NOTIFY_DISPLAY_OFF		0x89
 
 #define ACPI_VIDEO_HEAD_INVALID		(~0u - 1)
 #define ACPI_VIDEO_HEAD_END		(~0u)
@@ -1505,8 +1506,34 @@ static int
 acpi_video_get_next_level(struct acpi_video_device *device,
 			  u32 level_current, u32 event)
 {
-	/*Fix me */
-	return level_current;
+	int min, max, min_above, max_below, i, l;
+	max = max_below = 0;
+	min = min_above = 255;
+	for (i = 0; i < device->brightness->count; i++) {
+		l = device->brightness->levels[i];
+		if (l < min)
+			min = l;
+		if (l > max)
+			max = l;
+		if (l < min_above && l > level_current)
+			min_above = l;
+		if (l > max_below && l < level_current)
+			max_below = l;
+	}
+
+	switch (event) {
+	case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
+		return (level_current < max) ? min_above : min;
+	case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
+		return (level_current < max) ? min_above : max;
+	case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
+		return (level_current > min) ? max_below : min;
+	case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
+	case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
+		return 0;
+	default:
+		return level_current;
+	}
 }
 
 static void
diff --git a/drivers/misc/msi-laptop.c b/drivers/misc/msi-laptop.c
index fdb7153f4426..8e5e07e4c1cf 100644
--- a/drivers/misc/msi-laptop.c
+++ b/drivers/misc/msi-laptop.c
@@ -317,7 +317,8 @@ static int __init msi_init(void)
 
 	/* Register backlight stuff */
 
-	msibl_device = backlight_device_register("msi-laptop-bl", NULL, &msibl_props);
+	msibl_device = backlight_device_register("msi-laptop-bl", NULL, NULL,
+						&msibl_props);
 	if (IS_ERR(msibl_device))
 		return PTR_ERR(msibl_device);
 
diff --git a/drivers/usb/misc/appledisplay.c b/drivers/usb/misc/appledisplay.c
index 02cbb7fff24f..a7932a72d298 100644
--- a/drivers/usb/misc/appledisplay.c
+++ b/drivers/usb/misc/appledisplay.c
@@ -281,7 +281,7 @@ static int appledisplay_probe(struct usb_interface *iface,
 	/* Register backlight device */
 	snprintf(bl_name, sizeof(bl_name), "appledisplay%d",
 		atomic_inc_return(&count_displays) - 1);
-	pdata->bd = backlight_device_register(bl_name, pdata,
+	pdata->bd = backlight_device_register(bl_name, NULL, NULL,
 						&appledisplay_bl_data);
 	if (IS_ERR(pdata->bd)) {
 		err("appledisplay: Backlight registration failed");
diff --git a/drivers/video/aty/aty128fb.c b/drivers/video/aty/aty128fb.c
index 3feddf89d100..2e976ffcde0f 100644
--- a/drivers/video/aty/aty128fb.c
+++ b/drivers/video/aty/aty128fb.c
@@ -1834,7 +1834,7 @@ static void aty128_bl_init(struct aty128fb_par *par)
 
 	snprintf(name, sizeof(name), "aty128bl%d", info->node);
 
-	bd = backlight_device_register(name, par, &aty128_bl_data);
+	bd = backlight_device_register(name, info->dev, par, &aty128_bl_data);
 	if (IS_ERR(bd)) {
 		info->bl_dev = NULL;
 		printk(KERN_WARNING "aty128: Backlight registration failed\n");
diff --git a/drivers/video/aty/atyfb_base.c b/drivers/video/aty/atyfb_base.c
index 09684d7a7ce9..f2ebdd880085 100644
--- a/drivers/video/aty/atyfb_base.c
+++ b/drivers/video/aty/atyfb_base.c
@@ -2211,7 +2211,7 @@ static void aty_bl_init(struct atyfb_par *par)
 
 	snprintf(name, sizeof(name), "atybl%d", info->node);
 
-	bd = backlight_device_register(name, par, &aty_bl_data);
+	bd = backlight_device_register(name, info->dev, par, &aty_bl_data);
 	if (IS_ERR(bd)) {
 		info->bl_dev = NULL;
 		printk(KERN_WARNING "aty: Backlight registration failed\n");
diff --git a/drivers/video/aty/radeon_backlight.c b/drivers/video/aty/radeon_backlight.c
index 585eb7b9e636..3abfd4a380cc 100644
--- a/drivers/video/aty/radeon_backlight.c
+++ b/drivers/video/aty/radeon_backlight.c
@@ -163,7 +163,7 @@ void radeonfb_bl_init(struct radeonfb_info *rinfo)
 
 	snprintf(name, sizeof(name), "radeonbl%d", rinfo->info->node);
 
-	bd = backlight_device_register(name, pdata, &radeon_bl_data);
+	bd = backlight_device_register(name, rinfo->info->dev, pdata, &radeon_bl_data);
 	if (IS_ERR(bd)) {
 		rinfo->info->bl_dev = NULL;
 		printk("radeonfb: Backlight registration failed\n");
diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index db8c191b1201..9601bfe309ac 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -216,8 +216,10 @@ static const struct class_device_attribute bl_class_device_attributes[] = {
  * Creates and registers new backlight class_device. Returns either an
  * ERR_PTR() or a pointer to the newly allocated device.
  */
-struct backlight_device *backlight_device_register(const char *name, void *devdata,
-						   struct backlight_properties *bp)
+struct backlight_device *backlight_device_register(const char *name,
+	struct device *dev,
+	void *devdata,
+	struct backlight_properties *bp)
 {
 	int i, rc;
 	struct backlight_device *new_bd;
@@ -232,6 +234,7 @@ struct backlight_device *backlight_device_register(const char *name, void *devda
 	new_bd->props = bp;
 	memset(&new_bd->class_dev, 0, sizeof(new_bd->class_dev));
 	new_bd->class_dev.class = &backlight_class;
+	new_bd->class_dev.dev = dev;
 	strlcpy(new_bd->class_dev.class_id, name, KOBJ_NAME_LEN);
 	class_set_devdata(&new_bd->class_dev, devdata);
 
diff --git a/drivers/video/nvidia/nv_backlight.c b/drivers/video/nvidia/nv_backlight.c
index 5b75ae4e9457..df934bd21899 100644
--- a/drivers/video/nvidia/nv_backlight.c
+++ b/drivers/video/nvidia/nv_backlight.c
@@ -141,7 +141,7 @@ void nvidia_bl_init(struct nvidia_par *par)
 
 	snprintf(name, sizeof(name), "nvidiabl%d", info->node);
 
-	bd = backlight_device_register(name, par, &nvidia_bl_data);
+	bd = backlight_device_register(name, info->dev, par, &nvidia_bl_data);
 	if (IS_ERR(bd)) {
 		info->bl_dev = NULL;
 		printk(KERN_WARNING "nvidia: Backlight registration failed\n");
diff --git a/drivers/video/riva/fbdev.c b/drivers/video/riva/fbdev.c
index 345e8b1c1af8..1a13966b7d5b 100644
--- a/drivers/video/riva/fbdev.c
+++ b/drivers/video/riva/fbdev.c
@@ -384,7 +384,7 @@ static void riva_bl_init(struct riva_par *par)
 
 	snprintf(name, sizeof(name), "rivabl%d", info->node);
 
-	bd = backlight_device_register(name, par, &riva_bl_data);
+	bd = backlight_device_register(name, info->dev, par, &riva_bl_data);
 	if (IS_ERR(bd)) {
 		info->bl_dev = NULL;
 		printk(KERN_WARNING "riva: Backlight registration failed\n");
diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index 75e91f5b6a04..a5cf1beacb44 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -54,7 +54,7 @@ struct backlight_device {
 };
 
 extern struct backlight_device *backlight_device_register(const char *name,
-	void *devdata, struct backlight_properties *bp);
+	struct device *dev,void *devdata,struct backlight_properties *bp);
 extern void backlight_device_unregister(struct backlight_device *bd);
 
 #define to_backlight_device(obj) container_of(obj, struct backlight_device, class_dev)