This is a follow-up to my original post.
The results may not be the same for you, but this is what I did, which fixed the problem.
I have a KVM with four(4) computer connected. Three windows machines and one FreeBSD box. The issue was, when switching between windows machines, the monitor has a fixed Horizontal freq 60hz +/-
When I switched to the FreeBSD, the monitor freq always changed to a higher Horizontal Frequency.
My Monitor is a Optiquest Q51, which has an on screen monitor utility for adjusting diffrent screen attributes, but not the frequency.
I was able to see what the actual frequency was during a windows session.
- H 37.9 khz
- V 60.3 hz
Within xorg.conf.new I made a static assignment for H/V
This efectively stopped the monitor from changing frequencies when switching from/to differnt machines
I hope this helps others