ACPI: video: Add backlight=native DMI quirk for Lenovo Ideapad Z470

The Lenovo Ideapad Z470 predates Windows 8, so it defaults to using
acpi_video for backlight control. But this is not functional on this
model.

Add a DMI quirk to use the native backlight interface which works.

Link: https://bugzilla.suse.com/show_bug.cgi?id=1208724
Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index 18cc08c..0c376ed 100644 (file)
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -446,6 +446,15 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
                },
        },
        {
+        /* https://bugzilla.suse.com/show_bug.cgi?id=1208724 */
+        .callback = video_detect_force_native,
+        /* Lenovo Ideapad Z470 */
+        .matches = {
+               DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+               DMI_MATCH(DMI_PRODUCT_VERSION, "IdeaPad Z470"),
+               },
+       },
+       {
         /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
         .callback = video_detect_force_native,
         /* Lenovo Ideapad Z570 */