Campfire Time wrote:
Some cheap KVM switches do not send a signal to the MB of computers they don't have a "focus" on. So if you have the KVM focused on your laptop and Windows Updates forces a reboot on your desktop machine, it won't boot because its looking for the keyboard.
Correct.
However the OP needs to keep in mind that with many PCs the BIOS may or may not have all or even one of those choices listed.. So, your switch may or may not correctly function on your PC 100% of the time.
I would personally send that KVM back and find another one that does not require such changes (they do exist). The better KVMs simulate a keyboard and mouse for such booting purposes even when the switch is not set to that PC.
My company has gone through a few KVMs over the years, so far the only ones that seem to consistently work have been BlackBox and Belkin brands (they are not cheap $20 units).