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From: dengxiang <dengxiang@nfschina.com>
To: lenb@kernel.org,
	rafael@kernel.org,
	linux-acpi@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linux-edac@vger.kernel.org,
	platform-driver-x86@vger.kernel.org,
	wanghuiqiang@huawei.com,
	prime.zeng@hisilicon.com,
	tony.luck@intel.com
Cc: dengxiang <dengxiang@nfschina.com>
Subject: [PATCH] ACPI: video: Use vendor backlight on Lenovo X1 Carbon.
Date: Mon, 13 May 2024 11:38:34 +0800
Message-Id: <20240513033834.9174-1-dengxiang@nfschina.com>
Precedence: bulk
MIME-Version: 1.0
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Lenovo X1 Carbon advertises both native and vendor backlight
control interfaces.But Linux defaults to picking the native ACPI
video backlight interface, which will make that the vendor
zx_backlight interface to not work.

Add a DMI quirk to force use of the vendor interface.

Signed-off-by: dengxiang <dengxiang@nfschina.com>
---
 drivers/acpi/video_detect.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index 2cc3821b2b16..e647186b4e83 100644
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -875,6 +875,14 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
 		DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
 		},
 	},
+	{
+	 .callback = video_detect_force_vendor,
+	 /* Lenovo X1 Carbon */
+	 .matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "KaiTian"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "KaiTian X1 G1d"),
+		},
+	},
 	{ },
 };
 
-- 
2.30.2