From f0217c42c9ab3d772e543f635ce628b9478f70b6 Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@anholt.net>
Date: Tue, 1 Dec 2009 11:56:30 -0800
Subject: [PATCH] drm/i915: Fix DDC on some systems by clearing BIOS GMBUS
 setup.

This is a sync of a fix I made in the old UMS code.  If the BIOS uses
the GMBUS and doesn't clear that setup, then our bit-banging I2C can
fail, leading to monitors not being detected.

Signed-off-by: Eric Anholt <eric@anholt.net>
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