From: "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Date: Tue, 18 Apr 2023 08:42:00 +0200
Subject: ACPI: video: Add backlight=native DMI quirk for Lenovo Ideapad Z470
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git#linux-next
Git-commit: 96b709be183c56293933ef45b8b75f8af268c6de
Patch-mainline: Queued in subsystem maintainer repository
References: bsc#1208724

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>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/acpi/video_detect.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -446,6 +446,15 @@ static const struct dmi_system_id video_
 		},
 	},
 	{
+	 /* 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 */