Re: Linux TwinView - Maximize uses both monitors
Yes, the output shows that your Xserver sees two monitors, one at 0,0 that's 1920x1080, and another that starts at 1920,0 and is 1920x1080. This is correct and suggest that you are *not* using Dynamic Twinview. Which means that your window manager is ignoring those settings from the xinerama extension. Does the problem persist if you use metacity?
In ccsm --> general options --> display settings, is "Detect Outputs" enabled?