I have two Nvidia cards both with 2 heads and both configured as TwinView, so I have Screen0 and Screen1 in my xorg.conf.
ccsm sees both screens (displays them in the Screens drop-down at the top left), but Unity starts only on Screen0 by default. The displays on Screen1 only show the default white screen and default X mouse cursor, when I hover over them.
Is this the normal, expected behavior? Can I start Unity on Screen1 automatically without running custom shell scripts (like DISPLAY=:0.1 compiz --replace)?