linux-kernel - [PATCH AUTOSEL 4.19 5/8] ACPI: video: Add backlight=native DMI quirk for Dell G15 5515

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Message-Id: <20221119021610.1775469-5-sashal@kernel.org>
Date:   Fri, 18 Nov 2022 21:16:06 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Hans de Goede <hdegoede@...hat.com>,
        Iris <pawel.js@...tonmail.com>, Daniel Dadap <ddadap@...dia.com>,
        Sasha Levin <sashal@...nel.org>, rafael@...nel.org,
        linux-acpi@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 5/8] ACPI: video: Add backlight=native DMI quirk for Dell G15 5515

From: Hans de Goede <hdegoede@...hat.com>

[ Upstream commit f46acc1efd4b5846de9fa05f966e504f328f34a6 ]

The Dell G15 5515 has the WMI interface (and WMI call returns) expected
by the nvidia-wmi-ec-backlight interface. But the backlight class device
registered by the nvidia-wmi-ec-backlight driver does not actually work.

The amdgpu_bl0 native GPU backlight class device does actually work,
add a backlight=native DMI quirk for this.

Reported-by: Iris <pawel.js@...tonmail.com>
Reviewed-by: Daniel Dadap <ddadap@...dia.com>
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
---
Changes in v2:
- Add a comment that this needs to be revisited when dynamic-mux
  support gets added (suggested by: Daniel Dadap)
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/acpi/video_detect.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index 0ec74ab2a399..2008bba48b06 100644
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -511,6 +511,20 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
 		DMI_MATCH(DMI_BOARD_NAME, "GMxRGxx"),
 		},
 	},
+	/*
+	 * Models which have nvidia-ec-wmi support, but should not use it.
+	 * Note this indicates a likely firmware bug on these models and should
+	 * be revisited if/when Linux gets support for dynamic mux mode.
+	 */
+	{
+	 .callback = video_detect_force_native,
+	 /* Dell G15 5515 */
+	 .matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+		DMI_MATCH(DMI_PRODUCT_NAME, "Dell G15 5515"),
+		},
+	},
+
 	/*
 	 * Desktops which falsely report a backlight and which our heuristics
 	 * for this do not catch.
-- 
2.35.1