"Among the features for RandR 1.3 are querying state
without output probing, multi-monitor panning, display
transformations (translation, scaling, rotation, projection), and
support for standard outputs. We have talked about RandR 1.3
previously at Phoronix, so read our other RandR 1.3 articles for
more information. RandR 1.3 is being introduced with the
forthcoming X Server 1.6."