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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Alex Hung <alex.hung@canonical.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Subject: [PATCH 4.19 122/191] ACPI: video: use ACPI backlight for HP 635 Notebook
Date:   Tue,  3 Nov 2020 21:36:54 +0100
Message-Id: <20201103203244.697783509@linuxfoundation.org>
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From: Alex Hung <alex.hung@canonical.com>

commit b226faab4e7890bbbccdf794e8b94276414f9058 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/acpi/video_detect.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -274,6 +274,15 @@ static const struct dmi_system_id video_
 		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 */
 	{