Comment 22 for bug 296167

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Travis Hegner (thegner) wrote : Re: X.org will intermittently stop responding to mouse clicks on Ibex with Xinerama

I've struggled with twinview as well before upgrading to 3 monitors. It will do it's own xinerama type implementation, but I've noticed that the nvidia-settings does not turn off xinerama in the xorg.conf if it has already been set. This is usually only a problem if you merge settings when saving your xorg.conf.

Double check your xorg.conf and make sure you don't still have xinerama enabled, then reboot. That may prevent the task bar from spanning across two monitors.

on a side note, I read that 8.10 was supposed to be implementing some new Xrandr features, that were supposed to allow those of us with multiple displays to can xinerama, but I have yet to figure out how to make that work, or if it's possible with the proprietary nvidia drivers.