http://www.porteus.org/tutorials/26-gen ... -them.html
I just used guiexec to start with dual display at bootup.
Great!

Code: Select all
}
menuentry "Porteus XFCE x86-64 rc ISO" {
insmod part_msdos
insmod ext2
set root=(hd0,5)
set isofile="/isos/Porteus-XFCE-v4.0-x86_64.iso"
search --no-floppy --file --set=root $isofile
loopback loop $isofile
linux (loop)/boot/syslinux/vmlinuz from=$isofile extramod=/64_V32/porteus/modules/ changes=1_porteus login=root guiexec=/mnt/sda5/1old-bin/1_bin/benq acpi=
initrd (loop)/boot/syslinux/initrd.xz
}