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?
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/Backtraci ng ?
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?