ACPI video: fix an error when the brightness levels on AC and on Battery are same

when the brightness level on AC and brightness level on Battery
are same, the level_ac_battery is 1 in the current code,
which is wrong.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index cd4fb7543a90..21968ae6ed91 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -770,10 +770,12 @@ acpi_video_init_brightness(struct acpi_video_device *device)
          * In this case, the first two elements in _BCL packages
          * are also supported brightness levels that OS should take care of.
          */
-        for (i = 2; i < count; i++)
-                if (br->levels[i] == br->levels[0] ||
-                    br->levels[i] == br->levels[1])
+        for (i = 2; i < count; i++) {
+                if (br->levels[i] == br->levels[0])
                         level_ac_battery++;
+                if (br->levels[i] == br->levels[1])
+                        level_ac_battery++;
+        }
 
         if (level_ac_battery < 2) {
                 level_ac_battery = 2 - level_ac_battery;