This is a note to let you know that I've just added the patch titled ACPI: video: Add DMI quirk for GIGABYTE GB-BXBT-2807 to the 5.4-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-dmi-quirk-for-gigabyte-gb-bxbt-2807.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 8bf952490dbbee7359cfe1a841cd5a8f7736739a Author: Jasper St. Pierre <jstpierre@xxxxxxxxxxx> Date: Wed Dec 2 14:39:42 2020 +0800 ACPI: video: Add DMI quirk for GIGABYTE GB-BXBT-2807 [ Upstream commit 25417185e9b5ff90746d50769d2a3fcd1629e254 ] The GIGABYTE GB-BXBT-2807 is a mini-PC which uses off the shelf components, like an Intel GPU which is meant for mobile systems. As such, it, by default, has a backlight controller exposed. Unfortunately, the backlight controller only confuses userspace, which sees the existence of a backlight device node and has the unrealistic belief that there is actually a backlight there! Add a DMI quirk to force the backlight off on this system. Signed-off-by: Jasper St. Pierre <jstpierre@xxxxxxxxxxx> Reviewed-by: Chris Chiu <chiu@xxxxxxxxxxxxx> 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 55af78b55c51..301ffe5b8feb 100644 --- a/drivers/acpi/video_detect.c +++ b/drivers/acpi/video_detect.c @@ -143,6 +143,13 @@ static const struct dmi_system_id video_detect_dmi_table[] = { }, { .callback = video_detect_force_vendor, + .ident = "GIGABYTE GB-BXBT-2807", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"), + DMI_MATCH(DMI_PRODUCT_NAME, "GB-BXBT-2807"), + }, + }, + { .ident = "Sony VPCEH3U1E", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),