I have a brand new computer, running Kubuntu 9.04. If I unplug the VGA monitor, the system reboots. I have never seen this before. I am prepared to believe it is some weird hardware problem, and I have contacted the vendor for help, but their Linux guy is away (the lucky guy has been at the Olympics)--they swear they extensively tested before shipping, and want to defer the answer until he gets back.
My question is whether anybody knows of any setting in Linux that could cause this. It seems to me it must be hardware related. I have tried several monitors, etc, it happens on all of them--it does not happen when I power off the monitor instead of disconnecting it.