From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jani Nikula <jani.nikula@linux.intel.com>
Subject: Re: [PATCH] drm/i915 Trouble with minimum brightness
Date: Mon, 01 Dec 2014 11:34:55 +0200
Message-ID: <87k32bbtmo.fsf@intel.com>
References: <5478C9AA.2010600@aurabindo.in>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Return-path: <intel-gfx-bounces@lists.freedesktop.org>
In-Reply-To: <5478C9AA.2010600@aurabindo.in>
List-Unsubscribe: <http://lists.freedesktop.org/mailman/options/intel-gfx>,
 <mailto:intel-gfx-request@lists.freedesktop.org?subject=unsubscribe>
List-Archive: <http://lists.freedesktop.org/archives/intel-gfx>
List-Post: <mailto:intel-gfx@lists.freedesktop.org>
List-Help: <mailto:intel-gfx-request@lists.freedesktop.org?subject=help>
List-Subscribe: <http://lists.freedesktop.org/mailman/listinfo/intel-gfx>,
 <mailto:intel-gfx-request@lists.freedesktop.org?subject=subscribe>
Errors-To: intel-gfx-bounces@lists.freedesktop.org
Sender: "Intel-gfx" <intel-gfx-bounces@lists.freedesktop.org>
To: Jay Aurabind <mail@aurabindo.in>, Daniel Vetter <daniel.vetter@intel.com>, David Airlie <airlied@linux.ie>, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
List-Id: intel-gfx@lists.freedesktop.org
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=