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

From: Jiri Slaby (SUSE)
Date: Mon Apr 17 2023 - 06:53:26 EST


From: Hans de Goede <hdegoede@xxxxxxxxxx>

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@xxxxxxxxxx>
Cc: Hans de Goede <hdegoede@xxxxxxxxxx>
Cc: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
---
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