Patch "ACPI / video: Fix use_native_backlight selection logic" has been added to the 3.16-stable tree

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This is a note to let you know that I've just added the patch titled

    ACPI / video: Fix use_native_backlight selection logic

to the 3.16-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     acpi-video-fix-use_native_backlight-selection-logic.patch
and it can be found in the queue-3.16 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 25294e9f00f03b2b4f4c56e913bc8c573972f33b Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@xxxxxxxxxx>
Date: Thu, 28 Aug 2014 10:20:45 +0200
Subject: ACPI / video: Fix use_native_backlight selection logic

From: Hans de Goede <hdegoede@xxxxxxxxxx>

commit 25294e9f00f03b2b4f4c56e913bc8c573972f33b upstream.

Commit 751109aad583 ("ACPI / video: Change the default for
video.use_native_backlight to 1") has changed the default for
use_native_backlight from 0 to 1, but instead of changing
use_native_backlight_dmi to true, and leaving use_native_backlight_param at -1,
it has changed use_native_backlight_param to 1.

This causes acpi_video_use_native_backlight() to always think that a value was
specified through the param, making it impossible to add a dmi based quirk
to force 0 now that the default is 1.

This fixes this by restoring the use_native_backlight_param default to -1, and
instead setting the use_native_backlight_dmi default to true.

Fixes: 751109aad583 (ACPI / video: Change the default for video.use_native_backlight to 1)
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/acpi/video.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -82,9 +82,9 @@ module_param(allow_duplicates, bool, 064
  * For Windows 8 systems: used to decide if video module
  * should skip registering backlight interface of its own.
  */
-static int use_native_backlight_param = 1;
+static int use_native_backlight_param = -1;
 module_param_named(use_native_backlight, use_native_backlight_param, int, 0444);
-static bool use_native_backlight_dmi = false;
+static bool use_native_backlight_dmi = true;
 
 static int register_count;
 static struct mutex video_list_lock;


Patches currently in stable-queue which might be from hdegoede@xxxxxxxxxx are

queue-3.16/acpi-video-disable-native_backlight-on-hp-envy-15-notebook-pc.patch
queue-3.16/acpi-video-fix-use_native_backlight-selection-logic.patch
queue-3.16/acpi-video-add-a-disable_native_backlight-quirk.patch
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