1 files changed, 22 insertions, 8 deletions

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index b8a2095..bac956b 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -409,14 +409,17 @@ acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 static int
 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 {
-	int status;
+	int status = AE_OK;
 	union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 	struct acpi_object_list args = { 1, &arg0 };
 
 
 	arg0.integer.value = level;
-	status = acpi_evaluate_object(device->dev->handle, "_BCM", &args, NULL);
 
+	if (device->cap._BCM)
+		status = acpi_evaluate_object(device->dev->handle, "_BCM",
+					      &args, NULL);
+	device->brightness->curr = level;
 	return status;
 }
 
@@ -424,11 +427,11 @@ static int
 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 					unsigned long *level)
 {
-	int status;
-
-	status = acpi_evaluate_integer(device->dev->handle, "_BQC", NULL, level);
-
-	return status;
+	if (device->cap._BQC)
+		return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
+					     level);
+	*level = device->brightness->curr;
+	return AE_OK;
 }
 
 static int
@@ -1633,9 +1636,20 @@ static int
 acpi_video_get_next_level(struct acpi_video_device *device,
 			  u32 level_current, u32 event)
 {
-	int min, max, min_above, max_below, i, l;
+	int min, max, min_above, max_below, i, l, delta = 255;
 	max = max_below = 0;
 	min = min_above = 255;
+	/* Find closest level to level_current */
+	for (i = 0; i < device->brightness->count; i++) {
+		l = device->brightness->levels[i];
+		if (abs(l - level_current) < abs(delta)) {
+			delta = l - level_current;
+			if (!delta)
+				break;
+		}
+	}
+	/* Ajust level_current to closest available level */
+	level_current += delta;
 	for (i = 0; i < device->brightness->count; i++) {
 		l = device->brightness->levels[i];
 		if (l < min)