This exercise the bug fixed in
commit 94a335dba34ff47cad3d6d0c29b452d43a1be3c8
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Wed Jul 17 14:51:28 2013 +0200
drm/i915: correctly restore fences with objects attached
For fun I've also added a subtest for the inverse transition.
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>