Adjusting display / screen position using xvidtune
Many moons ago, I had to run an update to the nVidia driver for my Kubuntu box. After installing it, I found that the next time I ran X, my display was offset by about 50px to the right. Normally, it would have been possible to fix this via the monitor, most of which have a convenient "auto" button to solve such issues. However, my set-up involves the use of a KVM switch, which allows me to use a single keyboard, mouse and monitor for more than one PC (four in my case).
