[3.16.y-ckt stable] Patch "ACPI / video: Add disable_native_backlight quirk for Dell XPS15 L521X" has been added to staging queue

Luis Henriques luis.henriques at canonical.com
Mon Mar 2 13:35:34 UTC 2015

This is a note to let you know that I have just added a patch titled

    ACPI / video: Add disable_native_backlight quirk for Dell XPS15 L521X

to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree 
which can be found at:


This patch is scheduled to be released in version 3.16.7-ckt8.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.16.y-ckt tree, see



>From 7461b84ac1f72e64b93bdae8cee65e79b86d0ff0 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede at redhat.com>
Date: Mon, 5 Jan 2015 08:57:04 +0100
Subject: ACPI / video: Add disable_native_backlight quirk for Dell XPS15 L521X

commit 6a3ef10bacb08860805e9053f919786dc34760ba upstream.

The L521X variant of the Dell XPS15 has integrated nvidia graphics, and
backlight control does not work properly when using the native interfaces.

Link: https://bugzilla.redhat.com/show_bug.cgi?id=1163574
Signed-off-by: Hans de Goede <hdegoede at redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki at intel.com>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
 drivers/acpi/video.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 28fa58c11e56..b7bed5fdc433 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -711,6 +711,16 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
 		DMI_MATCH(DMI_PRODUCT_NAME, "370R4E/370R4V/370R5E/3570RE/370R5V"),
+	{
+	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
+	 .callback = video_disable_native_backlight,
+	 .ident = "Dell XPS15 L521X",
+	 .matches = {
+		},
+	},

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