I have just upgraded from Natty to Precise. The LCD monitor is connected through a Belkin KVM switch. When Ubuntu boots, everything is fine and the monitor comes up at it's max resolution 1280x1024. When I switch away using the KVM and then come back some time later, the monitor reports that the resolution is too high and presents only a blanked screen. xrandr shows that the video adapter is capable of 1600x1600, but the display device is not. I think that when the screen blanks while the KVM is switched to another session and then is restored, it is trying to go to 1600x1600 and hence is not supported. The only way for me to recover is to hard reboot. I have not been able to find any way to configure the system so it will NEVER try to use a resolution higher than 1280x1024.
Anyone have any suggestions?