The end of your Xorg.0.log files indicates that X is crashing. Could you
get a full backtrace with any of the methods described at
https://wiki.ubuntu.com/X/Backtracing ?
Also, is the crash triggered when the Virtual part is not commented out
even if an external monitor is not connected, or do you need the
external monitor connected as well?

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[i945] (UXA) 945GM [8086:27a2] (rev 03): Resolution width is limited to 2048
https://bugs.launchpad.net/bugs/382327
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