3.16.7-ckt8 -stable review patch.  If anyone has any objections, please let me 
know.

------------------

From: Hans de Goede <[email protected]>

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 <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
Signed-off-by: Luis Henriques <[email protected]>
---
 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 = {
+               DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+               DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
+               },
+       },
        {}
 };
 
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