This is a note to let you know that I've just added the patch titled ACPI: video: Add backlight=native DMI quirk for Acer Aspire 4810T to the 6.1-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: acpi-video-add-backlight-native-dmi-quirk-for-acer-a.patch and it can be found in the queue-6.1 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 91d2443f3f15475f39b32d65f04d6d528131081a Author: Hans de Goede <hdegoede@xxxxxxxxxx> Date: Fri Jan 13 12:41:26 2023 +0100 ACPI: video: Add backlight=native DMI quirk for Acer Aspire 4810T [ Upstream commit 8ba5fc4c154aeb3b4620f05543cce426c62ed2de ] The Acer Aspire 4810T predates Windows 8, so it defaults to using acpi_video# for backlight control, but this is non functional on this model. Add a DMI quirk to use the native backlight interface which does work properly. Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c index 5c32b318c173..b48f85c3791e 100644 --- a/drivers/acpi/video_detect.c +++ b/drivers/acpi/video_detect.c @@ -493,6 +493,14 @@ static const struct dmi_system_id video_detect_dmi_table[] = { DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"), }, }, + { + .callback = video_detect_force_native, + /* Acer Aspire 4810T */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Acer"), + DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 4810T"), + }, + }, { .callback = video_detect_force_native, /* Acer Aspire 5738z */