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>

diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index 0d3a384b508a9c4782b7fe20ca1264dc3b11b0bf..daaf1c4e1e0f78657afb1f140b49e0cf3162d6df 100644 (file)
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -232,6 +232,15 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
                          "900X3C/900X3D/900X3E/900X4C/900X4D"),
                },
        },
+       {
+        /* 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,