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

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

From: Aaron Lu <[email protected]>

commit 7d0b93499f4879ddbc75d594f4ea216ba964f78e upstream.

Several Samsung laptop models (SAMSUNG 870Z5E/880Z5E/680Z5E and
SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V) do not have a working
native backlight control interface so restore their acpi_videoX
interface.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=84221
Link: https://bugzilla.kernel.org/show_bug.cgi?id=84651
For SAMSUNG 870Z5E/880Z5E/680Z5E:
Reported-and-tested-by: Brent Saner <[email protected]>
Reported-by: Vitaliy Filippov <[email protected]>
Reported-by: Laszlo KREKACS <[email protected]>
For SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V:
Reported-by: Vladimir Perepechin <[email protected]>
Signed-off-by: Aaron Lu <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

---
 drivers/acpi/video.c |   17 +++++++++++++++++
 1 file changed, 17 insertions(+)

--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -505,6 +505,23 @@ static struct dmi_system_id video_dmi_ta
                DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
                },
        },
+
+       {
+        .callback = video_disable_native_backlight,
+        .ident = "SAMSUNG 870Z5E/880Z5E/680Z5E",
+        .matches = {
+               DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
+               DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
+               },
+       },
+       {
+        .callback = video_disable_native_backlight,
+        .ident = "SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V",
+        .matches = {
+               DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
+               DMI_MATCH(DMI_PRODUCT_NAME, 
"370R4E/370R4V/370R5E/3570RE/370R5V"),
+               },
+       },
        {}
 };
 


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