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We need to make sure that the atomic commit are consistent or else the kernel will reject it. For example, when moving a CRTC from one output to another one, the first output CRTC_ID property needs to be reset. Also if the second output was using another CRTC beforehands, it needs to be disabled to avoid an inconsistent state. Signed-off-by: Louis-Francis Ratté-Boulianne <lfrb@collabora.com> Tested-by: Daniel Stone <daniels@collabora.com> Reviewed-by: Adam Jackson <ajax@redhat.com>