I'm trying a manual setup of Xorg 1.9.5, for two identical monitors connected to the VGA and DVI ports of an nVidia GeForce 6600. I get the X Server to run using a single screen, and it appears identical on both monitors. Started with
Xorg -configure, and have tried to use two screens with the same device, but only one is recognized. It automatically recognized the "modesetting" driver, through the nouveau module in the kernel.
I had this working OK with Xorg 1.7.7 and similar hardware, using the nv driver and the "DualHead" and "DynamicTwinView" Device options. I don't find these options documented for nouveau and wonder if it is still possible to use it, as it loads by default into the kernel on my newer system (Slackware 13.37.0).
If the kernel driver needs to be removed, I have the nv and nouveau X drivers available. Any recomendations on which to use for DualHead would be appreciated.