Backported from X.org:

 commit c96c860b6420adf0d004707a323af30491a1d7d3
 Author: Michal Srb <msrb@suse.com>
 Date:   Mon Dec 12 17:45:22 2016 +0200

    xinerama: Swap the response in RRXineramaWriteMonitor
Reviewed-by: Adam Jackson <ajax@redhat.com>
Backported-to-NX-by: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>