I use 12.04. Till today I use it with an Acer trravelmate4070 and an LG screen in order to expand my desktop. Works great.
Till today that I decided to connect my LG screen to a KVM switch in order to share the big screen with an other PC when I need it. In the KVM switch the resolution is lower and I can not manually change it.
I read many solutions about making an .conf file but since I am new to Ubuntu I am afraid. Moreover I realized that these articles talk for the same problem but not as an extension screen but as a main screen. Any idea how to correctly configure this file?
These are the links that I consulted: