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I wondered about that one, too. Usually I do the following at the console: xhost + xrandr --auto xhost - Good news: In a few days, Xubuntu 14.04 will release, supporting monitor hot-plugging: details


After a bit more googling I found someone else who had a similar problem who noticed "Fatal: No composite extension" in their unity log as well, then looked in their xorg.conf to find: Section "Extensions" Option "Composite" "Disable" EndSection I found that in mine, too. And changing "Disable" to "Enable" allows unity to run. I guess ...


I have figured out the problem. Apparently something didn't upgrade correctly for the xserver-xorg-video-intel packages. So I followed the selected answer of this package How reinstall the default graphics drivers? which fixed the problem. Basically I reinstalled the packages and restarted the computer (it should be noted that the final terminal call ...


The display ids in X follow the form :<screen>.<display>. Contrary to intuition, all the monitors in a multiple-monitor setup share a <screen>, but have varying <display>. The screen "first" in the setup is :0.0, and others are :0.1, :0.2, etc. The final command is xcalib -invert -alter -display :0.1

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