Issue with a kvm console

[llawwehttam]

Hi folks.

 

Today I installed a kvm console into our rack and connected all the servers up.

 

The windows servers work beautifully. The linux ones however all look like this:

 

(sorry about the quality)

http://i.imgur.com/fPCJEN8l.jpg

(The distortion constantly changes)

 

It's running Scientific Linux 6.3.

 

KVM is: Lindy 19" Modular KVM Terminal no: 21615 with KVM Switch - U16C Modular no: 39531

 

Video is connected via VGA, keyboard/touchpad via USB.

 

I can't reboot the machines as they are in use 24/7 so if they require a reboot I'll have to arrange for downtime.

Any ideas?

 

If I unplug and reconnect the KVM it's clear for about 2-3 seconds then becomes distorted again.

 

Any ideas? I'm at a loss.

Edited January 30, 2014 by llawwehttam

[llawwehttam]

Nobody got any ideas?

 

Is there a more relevant section I should post this in?

[newpersn]

What's the resolution like on the linux boxes.

 

Does look like it's a graphics problem. Refresh rate sat too high or its out of range.

 

Windows will adjust automatically when a different monitor is plugged in.

[llawwehttam]

Not sure about the resolution, the boxes just have tty's and don't have a modeline set. The monitor reports the frequency at 72hz though which seems a bit high.