From: Zhang Rui <rui.zhang@intel.com>
Date: Wed, 20 Jun 2012 01:48:43 +0000 (+0800)
Subject: ACPI video: Still use ACPI backlight control if _DOS doesn't exist
X-Git-Tag: v3.5-rc5~4^2^3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b03738430c7537d5f87948e0b35d8aaf2688c6b4;p=pandora-kernel.git

ACPI video: Still use ACPI backlight control if _DOS doesn't exist

This fixes a regression in 3.4-rc1 caused by commit
ea9f8856bd6d4ed45885b06a338f7362cd6c60e5
(ACPI video: Harden video bus adding.)

Some platforms don't have _DOS control method, but the ACPI
backlight still works.
We should not invoke _DOS for these platforms.

https://bugzilla.kernel.org/show_bug.cgi?id=43168

Cc: Igor Murzov <intergalactic.anonymous@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
---

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