[patch 14/29] ACPI: VIDEO: Adjust current level to closest available one.

[Greg Kroah-Hartman <gregkh@suse.de>]

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2.6.23-stable review patch.  If anyone has any objections, please let us
know.

------------------
From: Alexey Starikovskiy <astarikovskiy@suse.de>

patch 63f0edfc0b7f8058f9d3f9b572615ec97ae011ba in mainline.

ACPI: VIDEO: Adjust current level to closest available one.


Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>
Cc: Tobias Powalowski <t.powa@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 drivers/acpi/video.c |   13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -1633,9 +1633,20 @@ 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)

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