I am using a Slackware 13.37 system (ASUS P8H67-M LE) with built-in Intel HD graphics, and I am trying to get the monitor outputs to be attached to seperate X windows screens (i.e. different $DISPLAY). Letting XOrg do auto-detection results in mirrored monitors, and using Xrandr I can get an extended desktop on a single X display that spans both monitors, neither of which is what I need.
Have seen this referred to in places as Zaphod mode, but most of that goes into multi-seat configurations where each screen has independent mouse/keyboard (sometimes via elaborate running of multiple X-servers). Multi-seating is not a requirement, as what I am trying to build is non-interactive.
I know this has to be done via editing xorg.conf, and it requires using duplicate Display/Monitor/Device sections, but so far I have not been able to get this to work.