[SRU][Trusty/Utopic] UBUNTU: SAUCE: Add use_native_backlight quirk for HP ProBook 6570b

[AceLan Kao]

BugLink: http://bugs.launchpad.net/bugs/1359010

SRU Justification:

Impact: The ACPI video backlight interface is broken under WIN8 OSI,
have to switch to use native backlight interface.

Fix: Add this machine into quirk to force it use native backlight interface

Testcase: Tested on HP ProBook 6570b laptop

The quirk mechanism has been remove since v3.18-rc1
   e4d38b5 ACPI / video: Remove video_set_use_native_backlight quirk
After this commit which is in 3.17-rc4, it will use native backlight as default
   25294e9 ACPI / video: Fix use_native_backlight selection logic
So, we can't upstream this patch, and we also need it in vivid.

Signed-off-by: AceLan Kao <acelan.kao at canonical.com>
---
 drivers/acpi/video.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index e858463..db1dccd 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -604,6 +604,14 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
 		DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8780w"),
 		},
 	},
+	{
+	.callback = video_set_use_native_backlight,
+	.ident = "HP ProBook 6570b",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "HP ProBook 6570b"),
+		},
+	},
 	{}
 };
 
-- 
2.1.0