[ubuntu] Screen Resolution and KVM Switch

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http://ubuntuforums.org – I have recently upgraded from 10.04 to 12.04. I use a KVM switch to flip between machines. Since upgrading, if I am on my other machine for more than a couple of minutes, when I switch back to the Ubuntu 12.04 machine the screen resolution / aspect ratio seems to shift slightly. This results in slightly stretched fonts etc and I invariably have to quit apps, logout and log back in to get it to reset it. I never had this problem on 10.04 Is there any way for me to force it to stay put? Thank you for any pointers. (Hardware)