I use a KVM to switch between PC's and my Macs. When I switch away from the Mac, the system suspends as though it is asleep and it doesn't do any work. I have it set to never sleep when plugged in but that doesn't seem to prevent it when you switch off the focus via KVM to use a different machine.

Does anyone know a tweak to get around that issue? Maybe I don't have it configured correctly or there's a setting I don't know about.

hi, perhaps a non detection of monitor cause the problem ?

have to use a vga*dvi dongle with resistors ?

http://www.geeks3d.com/20110622/vga-hack-test-dummy-vga-dongle-win7-three-radeon-hd-5770-multi-gpu-opencl-single-monitor/
http://www.geeks3d.com/20091230/vga-hack-how-to-make-a-vga-dummy-plug/

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Hmm, I'm not sure how that would work with a Macbook Air (laptop). I need to be able to switch to it and have it hooked to the KVM switch or it doesn't show on the big monitor.

I could leave the laptop open but I need the space under the shelf and like to keep it closed when it's tethered to the local desktop workspace.

I can't seem to find much on google where this issue is addressed. I wonder am I searching the wrong terms (system suspending, kvm, macbook)

First, I'm not an "Apple" person, so my thought may be wrong...
The laptop is going to sleep when it detects no keyboard activity, which when connected to the external screen & keyboard was being provided by a "heartbeat" from one or other of them, swapping the keyboard via the KVM to the other ocmputer removes this heartbeat, so the laptop thinks there is no activity and goes to sleep.
How to get over this? Have a look at the "power management" settings on the laptop, in particular those that put it to sleep and set everything to "never sleep".

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Bob Smith
Member of Seti PIPPS (Pluto is a Planet Protest Society)
Somewhere in the (un)known Universe?

Yes, I set it to never sleep - the problem only happens if I switch away to another computer.