From: Ash Willis <ashwillis.kernel@gmail.com>
Date: Wed, 29 May 2013 01:27:59 +0000 (+0000)
Subject: ACPI / video: ignore BIOS initial backlight value for HP Pavilion g6
X-Git-Tag: next-20130607~73^2~8^2~3
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=780a6ec640a3fed671fc2c40e4dd30c03eca3ac3;p=karo-tx-linux.git

ACPI / video: ignore BIOS initial backlight value for HP Pavilion g6

This patch addresses kernel bug 56661. BIOS reports an incorrect
backlight value, causing the driver to switch off the backlight
completely during startup. This patch ignores the incorrect value from
BIOS.

References: https://bugzilla.kernel.org/show_bug.cgi?id=56661
Signed-off-by: Ash Willis <ashwillis@programmer.net>
Cc: All <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index d0937ab3fb6d..5d7075d25700 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -456,6 +456,14 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
 		DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dm4 Notebook PC"),
 		},
 	},
+	{
+	 .callback = video_ignore_initial_backlight,
+	 .ident = "HP Pavilion g6 Notebook PC",
+	 .matches = {
+		 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
+		 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
+		},
+	},
 	{
 	 .callback = video_ignore_initial_backlight,
 	 .ident = "HP 1000 Notebook PC",