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xscreensaverby the sounds of it. Multimonitor gaming can be configured to leave gaps between screens as if the pixels were obscured by the monitor bezels as this apparently makes things look much better, but I don't think X11 supports anything like this so it would be tricky to build in toxscreensaverI think. The alternative - customxrandrgeometry with gaps between viewports - may be annoying as the mouse cursor disappears for a while as it moves between monitors.