This is one of those times where I love and hate Linux.
I'm learning new things but it is taking a long time to be where I want to be. Further research led be to a command utility: ddcprobe. This utility pulls the monitor information directly from the monitor (called EDID).
It is clear from the output now why the monitor will only display 1600x 1200, it is because that is what the monitor is telling the system. The interesting thing is when using the VGA connector you can use the modeline to override but this does not work with the DVI. With the VGA connector I'm at the proper and recommended resolution of 1920x1080
So I continued my search an apparently you can redirect X to look at a EDID on the file system. I found another utility to read/write EDID so I will try this as well. BTW here is my EDID as read by ddcprobe:
EDID ver. 1 rev. 3.
EISA ID: SAM1483
Serial number: 4c523234.
Manufactured in week 2 of 2010.
Input signal type: composite sync, sync on green, analog signal.
Screen size max 53 cm horizontal, 30 cm vertical.
DPMS flags: RGB, active off, no suspend, no standby.
720x400 @ 70 Hz (VGA 640x400, IBM)
720x400 @ 88 Hz (XGA2)
640x480 @ 75 Hz (VESA)
1024x768 @ 87 Hz Interlaced (8514A)
Standard timing 0: 60 Hz, 1280x1280
Standard timing 1: 60 Hz, 1280x960
Standard timing 2: 60 Hz, 1280x1024
Standard timing 3: 60 Hz, 1440x1440
Standard timing 4: 60 Hz, 1600x1200
Standard timing 5: 60 Hz, 1680x1680
Detailed timing 0:
Pixel clock: 148500000
Horizontal active time (pixel width): 384
Horizontal blank time (pixel width): 1816
Vertical active time (pixel height): 56
Vertical blank time (pixel height): 1069
Horizontal sync offset: 88
Horizontal sync pulse width: 44
Vertical sync offset: 5
Vertical sync pulse width: 4
Monitor details 1:
Timing ranges: horizontal = 30 - 81, vertical = 56 - 60
Monitor details 2:
Monitor details 3:
Serial number: HVLZ102639