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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     "Jasper St. Pierre" <jstpierre@mecheye.net>,
        Chris Chiu <chiu@endlessos.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
        Sasha Levin <sashal@kernel.org>, linux-acpi@vger.kernel.org
Subject: [PATCH AUTOSEL 5.4 090/130] ACPI: video: Add DMI quirk for GIGABYTE GB-BXBT-2807
Date:   Tue, 22 Dec 2020 21:17:33 -0500
Message-Id: <20201223021813.2791612-90-sashal@kernel.org>
In-Reply-To: <20201223021813.2791612-1-sashal@kernel.org>
References: <20201223021813.2791612-1-sashal@kernel.org>
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From: "Jasper St. Pierre" <jstpierre@mecheye.net>

[ 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@mecheye.net>
Reviewed-by: Chris Chiu <chiu@endlessos.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.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 55af78b55c513..301ffe5b8feb0 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"),
-- 
2.27.0