I was wrong, it is not a duplicate of bug #195183.
Furthermore I solved it by disabling Xinerama:
Option "Xinerama" "false"
in the ServerLayout section of xorg.conf
I was wrong, it is not a duplicate of bug #195183.
Furthermore I solved it by disabling Xinerama:
Option "Xinerama" "false"
in the ServerLayout section of xorg.conf