From b226faab4e7890bbbccdf794e8b94276414f9058 Mon Sep 17 00:00:00 2001

From: Alex Hung <alex.hung@canonical.com>

Date: Sun, 13 Sep 2020 16:34:03 -0600

Subject: [PATCH] ACPI: video: use ACPI backlight for HP 635 Notebook

Git-commit: b226faab4e7890bbbccdf794e8b94276414f9058

Patch-mainline: v5.10-rc1

References: git-fixes

The default backlight interface is AMD's radeon_bl0 which does not

work on this system, so use the ACPI backlight interface on it

instead.

Buglink: https://bugs.launchpad.net/bugs/1894667

Cc: All applicable <stable@vger.kernel.org>

Signed-off-by: Alex Hung <alex.hung@canonical.com>

[ rjw: Changelog edits ]

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Acked-by: Takashi Iwai <tiwai@suse.de>

---

 drivers/acpi/video_detect.c | 9 +++++++++

 1 file changed, 9 insertions(+)

diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c

index 2499d7e3c710..36b62e9c8b69 100644

--- a/drivers/acpi/video_detect.c

+++ b/drivers/acpi/video_detect.c

@@ -282,6 +282,15 @@ static const struct dmi_system_id video_detect_dmi_table[] = {

 		DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),

 		},

 	},

+	/* https://bugs.launchpad.net/bugs/1894667 */

+	{

+	 .callback = video_detect_force_video,

+	 .ident = "HP 635 Notebook",

+	 .matches = {

+		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),

+		DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),

+		},

+	},

 	/* Non win8 machines which need native backlight nevertheless */

 	{

-- 

2.16.4