[patch 43/53] ACPI: video: Fix reversed brightness behavior onThinkPad SL series

[Greg KH]

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

From: Zhang Rui <rui.zhang@xxxxxxxxx>

commit 935e5f290ec1eb0f1c15004421f5fd3154380fd5 upstream.

Section B.6.2 of ACPI 3.0b specification that defines _BCL method
doesn't require the brightness levels returned to be sorted.
At least ThinkPad SL300 (and probably all IdeaPads) returns the
array reversed (i.e. bightest levels have lowest indexes), which
causes the brightness management behave in completely reversed
manner on these machines (brightness increases when the laptop is
idle, while the display dims when used).

Sorting the array by brightness level values after reading the list
fixes the issue.

http://bugzilla.kernel.org/show_bug.cgi?id=12037

Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
Tested-by: Lubomir Rintel <lkundrak@xxxxx>
Signed-off-by: Len Brown <len.brown@xxxxxxxxx>
Signed-off-by: Thomas Renninger <trenn@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/acpi/video.c |   15 +++++++++++++++
 1 file changed, 15 insertions(+)

--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -36,6 +36,7 @@
 #include <linux/backlight.h>
 #include <linux/thermal.h>
 #include <linux/video_output.h>
+#include <linux/sort.h>
 #include <asm/uaccess.h>
 
 #include <acpi/acpi_bus.h>
@@ -631,6 +632,16 @@ acpi_video_bus_DOS(struct acpi_video_bus
 }
 
 /*
+ * Simple comparison function used to sort backlight levels.
+ */
+
+static int
+acpi_video_cmp_level(const void *a, const void *b)
+{
+	return *(int *)a - *(int *)b;
+}
+
+/*
  *  Arg:	
  *  	device	: video output device (LCD, CRT, ..)
  *
@@ -681,6 +692,10 @@ acpi_video_init_brightness(struct acpi_v
 		count++;
 	}
 
+	/* don't sort the first two brightness levels */
+	sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
+		acpi_video_cmp_level, NULL);
+
 	if (count < 2)
 		goto out_free_levels;
 

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