This is a note to let you know that I've just added the patch titled
ACPI / video: disable native backlight for ThinkPad X201s
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-disable-native-backlight-for-thinkpad-x201s.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 789eeea128925741e0a105357bebf8855d3bcdee Mon Sep 17 00:00:00 2001
From: Aaron Lu <aaron.lu@xxxxxxxxx>
Date: Fri, 19 Sep 2014 10:01:18 +0800
Subject: ACPI / video: disable native backlight for ThinkPad X201s
From: Aaron Lu <aaron.lu@xxxxxxxxx>
commit 789eeea128925741e0a105357bebf8855d3bcdee upstream.
The ThinkPad X201s has a working ACPI video backlight interface and is
shipped before Win8; then there is BIOS update that starts to query
_OSI("Windows 2012") and that would make our video module stop creating
backlight interface and caused problem for the user. Add it to the DMI
table to disable native backlight to fix this problem.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=81691
Link: https://bugzilla.kernel.org/show_bug.cgi?id=51231
Reported-and-tested-by: Yves-Alexis Perez <corsac@xxxxxxxxxx>
Signed-off-by: Aaron Lu <aaron.lu@xxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/acpi/video.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -675,6 +675,14 @@ static struct dmi_system_id video_dmi_ta
DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
},
},
+ {
+ .callback = video_disable_native_backlight,
+ .ident = "ThinkPad X201s",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+ DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
+ },
+ },
/* The native backlight controls do not work on some older machines */
{
Patches currently in stable-queue which might be from aaron.lu@xxxxxxxxx are
queue-3.16/acpi-video-disable-native-backlight-for-thinkpad-x201s.patch
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