KVM problems

Jonathan Hutchins hutchins at tarcanfel.org
Sun Jan 12 17:01:49 CST 2003


Quoting Matt Luettgen <matt at tccassociates.net>:

> I bought a 4 port ps/2 KVM switch and keep loosing functionality of my
> keyboard and mouse, but mouse mostly.  I was wondering if there were
> any suggestions on a fix short of going digital.  I'm sure the problem
> is with the kvm and not the systems as if I mess with it enough I can
> regain control

I've found that the mechanical switches can be deadly to the motherboard.  The 
main thing you need is a clean break between systems - if you end up sliding 
across the contacts from system 1 to system 2, Bad Things Happen.  One solution 
is to leave a "blank" between your two main systems:

A:  Windows Box
B:  No Connection
C:  Linux Box

Of course, that means only two systems on the four port switch.  The other is 
to switch to a "blank" position, then back to a live one.  This may work with 
up to three systems on a four port switch.

Frankly though, for more than two systems or for any serious work, it's worth 
the money for an electronic switch.  Get one that will emulate the mouse when 
it's not online so reboots are easier if you can.  Shop lots - you can find 
decent ones from about $100 to well over $1,000.

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