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This is called a "multiseat X" configuration. There's a page on Ubuntu Wiki about it: https://help.ubuntu.com/community/MultiseatX Other links: How to set up a multiseat system? http://unix.stackexchange.com/questions/19340/how-can-i-run-a-separate-x-session-on-a-different-physical-display


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There is a very detailed and comprehensive post by Nicolas Bernaerts to rearrange a multiple-monitor setting using xrandr and make the changes persistent here. The post mentions that it is for a dual-monitor setup but it can also be used for a triple-monitor setup.


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I had the same kind of problems, but I added the http://ppa.launchpad.net/xorg-edgers/ppa/ubuntu and they are much quicker to solve problems with drivers then the standard Ubuntu repositories... I currently have the 346.16 driver installed and that did away with all that flickering...


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Having the monitor in standby and not off before pushing the Mac's power button solved the issue.


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I believe this is a bug, and the only solution is to set your options to "Do Nothing". Quite simple really go to System Settings Then click on Power Settings Set the When the Lid is Closed options to Do Nothing You can now close your lid and your laptop will not shutdown. If your external monitor goes black just move your mouse or click mouse button ...


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You can do this, but the second screen will appear a little fuzzy as the pixels will be interpolated. You will be telling xrandr to create a scaling factor for the second screen, so that the desired resolution is squished onto the display. In a terminal, enter the following command xrandr --output VGA1 --mode 1024x768 --scale 1.334x1 --panning 1366x768



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