DRM framebuffer removal broken since 13803132

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Hi!

The commit

>From 13803132818cf8084d169617be060fd8e3411a98 Mon Sep 17 00:00:00 2001
From: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Date: Wed, 9 Sep 2015 16:40:56 +0200
Subject: [PATCH] drm/core: Preserve the framebuffer after removing it.

badly breaks vmwgfx multimon since the crtcs are no longer turned off at
framebuffer removal,
which is part of the user-space contract.

Also isn't this a security issue, since at, for example, Xorg crash, the
crtcs can be left scanning out from memory
DRM no longer owns?

/Thomas


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