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From: Hans de Goede <hdegoede@redhat.com>
Date: Fri, 21 Nov 2014 13:39:19 +0100
Subject: [PATCH] acpi-video: Add disable_native_backlight quirk for Dell XPS15
 L521X

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

BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1163574
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/acpi/video.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 8a61e5dd397b..25863442b6ae 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -522,6 +522,15 @@ 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 = {
+		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+		DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
+		},
+	},
 	{}
 };
 
-- 
2.1.0