ACPI / video: Add a quirk to force acpi-video backlight on Dell XPS L421X

Just like the Dell XPS 15 (L521X) the Dell XPS 14 (L421X) needs to use
the acpi-video backlight interface rather then the native one for backlight
control to work, add a quirk for this.

Link: https://bugzilla.redhat.com/show_bug.cgi?id=1272633
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index 0d3a384b508a..daaf1c4e1e0f 100644
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -233,6 +233,15 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
                 },
         },
         {
+         /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
+         .callback = video_detect_force_video,
+         .ident = "Dell XPS14 L421X",
+         .matches = {
+                DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+                DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
+                },
+        },
+        {
          /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
          .callback = video_detect_force_video,
          .ident = "Dell XPS15 L521X",