can't set 60hz v refresh rate

[sean]

On fc4, updated, I have a dell flat screen with a intel 
i915g chips - using xoreg i820 - that I want to run at 
1280x1024x60.

Desktop-> Preferences -> Screen Resoltuion does not let me 
change the refresh rate. It stays at 75hz.

I hand edited xorg.conf so that the monitor section has

VertRefresh   60

No luck.

So I tried disabling the drivers DDC

Option "DDC"  "no"

But now it tries to run at 1600x1200 - out of range.

BTW, the Mode line of the Display subsection of Screen had 
"1280x1024" and  "1024x780".

Any suggestion appreciated.

sean