From 84c34858a85ecf9dabd72847d860c7d3fb7536e7 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Thu, 28 Aug 2014 10:20:47 +0200
Subject: [PATCH] ACPI / video: Disable native_backlight on HP ENVY 15 Notebook
 PC

Link: https://bugs.freedesktop.org/show_bug.cgi?id=81515
Reported-and-tested-by: Hohahiu <rakothedin@gmail.com>
Cc: 3.16+ <stable@vger.kernel.org> # 3.16+
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/video.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index dd5c30257b86..fcbda105616e 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -750,6 +750,17 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
 		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
 		},
 	},
+
+	/* The native backlight controls do not work on some older machines */
+	{
+	 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
+	 .callback = video_disable_native_backlight,
+	 .ident = "HP ENVY 15 Notebook",
+	 .matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
+		},
+	},
 	{}
 };
 
-- 
2.11.0