linux-kernel - [PATCH] ACPI: Add DMI quirk for GIGABYTE GB-BXBT-2807

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Date:   Wed,  2 Dec 2020 14:39:42 +0800
From:   Chris Chiu <chiu@...lessos.org>
To:     rjw@...ysocki.net, lenb@...nel.org
Cc:     linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux@...lessos.org, "Jasper St. Pierre" <jstpierre@...heye.net>,
        Chris Chiu <chiu@...lessos.org>
Subject: [PATCH] ACPI: Add DMI quirk for GIGABYTE GB-BXBT-2807

From: "Jasper St. Pierre" <jstpierre@...heye.net>

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@...heye.net>
Reviewed-by: Chris Chiu <chiu@...lessos.org>
---
 drivers/acpi/video_detect.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index 2499d7e3c710..ac2e194acdbf 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"),
-- 
2.20.1