linux-kernel - [PATCH] ACPI: video: Add backlight=native DMI quirk for Lenovo Ideapad Z470

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Message-Id: <20230417104817.30254-1-jirislaby@kernel.org>
Date:   Mon, 17 Apr 2023 12:48:17 +0200
From:   "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
To:     rafael@...nel.org
Cc:     linux-kernel@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>,
        Jiri Slaby <jirislaby@...nel.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH] ACPI: video: Add backlight=native DMI quirk for Lenovo Ideapad Z470

From: Hans de Goede <hdegoede@...hat.com>

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@...nel.org>
Cc: Hans de Goede <hdegoede@...hat.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/acpi/video_detect.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index 69ef2d9710c2..af5cea005f54 100644
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -459,6 +459,15 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
 		DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
 		},
 	},
+	{
+	 /* 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,
-- 
2.40.0