I have done a lot of Googling and I can't make sense of all the information.
I want to remotely operate a Lubuntu 14.04 machine from another of the same type. The remote machine has no monitor attached. I have Teamviewer10 on both machines.
The problem is that with no monitor attached, the remote desktop has only 1024x768 resolution. xrandr shows LVDS1 to be connected, although it isn't, and it only allows 1024x768 resolution.
The solution appears to entail using xrandr to test resolution, and then inserting the xrandr commands somewhere to execute the commands on startup/login, and make the change permanent. It is also possible that I need to create /etc/X11/xorg.conf and set up a dummy monitor. I really do not understand the steps entailed in that, and many Googlees say it does not work anyway. Some say I need a hardware dongle (I really cannot believe that you need hardware to do something like this - it must be a common requirement to use a machine without a monitor).
I would be very grateful if somebody could tell me if I am on the right track and make these ideas more concrete. I do not really want to hear about solutions using other remote viewing software (vnc etc). I may try these ideas in the future when I have time, but right now I want to make it work using Teamviewer (because thus far I have found it to be less laggy than other software when some of the screen contains video).