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 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html