Viewsonic VP2330wb wide display

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I recently purchased a SuperMicro dual Opteron motherboard with an
on-board ATI ES1000 video chipset capable of 1600x1200x24. I'm having
little success hooking it up with a Viewsonic VP2330wb display that wants
-- very much it seems -- to display 1920x1200.

system-config-display detects the ET1000 and applies the radeon driver.
The monitor is not in the ViewSonic list, so I select the generic "LCD
Panel 1920x1200". The generic LCD and ViewSonic have different sync rates:

              LCD Panel 1920x1200     ViewSonic VP2330wb
HorizSync     31.5 - 90.0             24.0 - 96.0
VertSync      59.9 - 60.1             50.0 - 85.0

I've manually edited /etc/X11/xorg.conf to insert the ViewSonic's numbers.
But no matter what set of numbers I use, I am unable to get the monitor to
display any higher resolutions than 1280x1024, and even then it appears in
a smaller virtual window with a 4:3 aspect ratio. I have tried all three
of the monitor's three Scaling options: Fill All, Fill Aspect Ratio, and

The monitor periodically complains it is not being driven at 1920x1200,
but at resultions higher than 1280x1024 the monitor complains "Out of
Range". To access resolutions higher than 1680x1050 I backed down from
Millions of Colors to Thousands of Colors (depth = 16).

I have been unable to hit on any combination of mode, scaling, sync, or
depth to get a 1920x1200 display. I'm just about at my wits end.

--Doc Savage
  Fairview Heights, IL

P.S. Please don't suggest an add-in video board. This is a very new server
motherboard. Its only video option is a small black PCI-Extended x8 slot,
and I'm not aware of any video boards available with a PCI-e/x8 interface.

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