From: Alex Hung <alex.hung@canonical.com>
Date: Tue, 28 May 2013 02:05:09 +0000 (+0000)
Subject: ACPI / video: ignore BIOS initial backlight value for HP m4
X-Git-Tag: upstream/snapshot3+hdmi~4970^2~1^2~4
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=fedbe9bc6fd3e14b1ffbb3dac407777ac4a3650c;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

ACPI / video: ignore BIOS initial backlight value for HP m4

On HP m4 lapops, BIOS reports minimum backlight on boot and
causes backlight to dim completely. This ignores the initial backlight
values and set to max brightness.

References: https://bugs.launchpad.net/bugs/1184501
Cc: All <stable@vger.kernel.org>
Signed-off-by: Alex Hung <alex.hung@canonical.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 5b32e15..d0937ab 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -464,6 +464,14 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
 		DMI_MATCH(DMI_PRODUCT_NAME, "HP 1000 Notebook PC"),
 		},
 	},
+	{
+	 .callback = video_ignore_initial_backlight,
+	 .ident = "HP Pavilion m4",
+	 .matches = {
+		DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion m4 Notebook PC"),
+		},
+	},
 	{}
 };