Raising the refresh rate of an external display

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I've seen quite a number of posts about external display problems recently and 
I've been trying to apply the solutions to my system (a Vaio laptop with a 
i830 chipset) but had no luck so far.

What I'm trying to do is display to an external monitor at a higher frequency 
than 60Hz.
I've tried to force the refresh rate by fixing the value of the VertRefresh 
option to 75 but it doesn't change anything.
The X log tells me that it does detect a 1024x768@75Hz mode and it apparently 
also tells me that it's using a 85Hz (!) refresh rate, but my external 
monitor still tells me 60Hz (and my eyes confirm).
See below for bits of the concerned files.

I'm wondering what the source of the problem is: is this a i830-specific 
problem (or even a vaio-specific one), a X problem, or is it just me? Any 
help would be very much appreciated!




Section "Monitor"
    Identifier  "Vaio LCD"
    HorizSync   28.0-49.0
    VertRefresh 75
    Option      "DPMS"




(II) I810(0): Currently active displays on Pipe A:
(II) I810(0):     CRT
(II) I810(0):     LFP (Local Flat Panel) child device


(II) I810(0): Supported VESA Video Modes:
(II) I810(0): 640x480@60Hz
(II) I810(0): 640x480@67Hz
(II) I810(0): 640x480@72Hz
(II) I810(0): 640x480@75Hz
(II) I810(0): 800x600@56Hz
(II) I810(0): 800x600@60Hz
(II) I810(0): 800x600@72Hz
(II) I810(0): 800x600@75Hz
(II) I810(0): 832x624@75Hz
(II) I810(0): 1024x768@60Hz
(II) I810(0): 1024x768@70Hz
(II) I810(0): 1024x768@75Hz
(II) I810(0): 1280x1024@75Hz
(II) I810(0): 1152x870@75Hz
(II) I810(0): Manufacturer's mask: 0
(II) I810(0): Supported Future Video Modes:
(II) I810(0): #0: hsize: 640  vsize 480  refresh: 70  vid: 18993
(II) I810(0): #1: hsize: 832  vsize 624  refresh: 75  vid: 20297
(II) I810(0): #2: hsize: 1600  vsize 1200  refresh: 60  vid: 16553
(II) I810(0): #3: hsize: 1280  vsize 1024  refresh: 75  vid: 36737
(II) I810(0): #4: hsize: 1024  vsize 768  refresh: 85  vid: 22881
(II) I810(0):
(II) I810(0):
(II) I810(0):
(II) I810(0):
(==) I810(0): DPI set to (75, 75)
(WW) I810(0): Pitch is bigger than local/stolen size. Defaulting
        to original display width
(--) I810(0): Virtual size is 1024x768 (pitch 1024)
(**) I810(0): Default mode "1024x768": 94.5 MHz (scaled from 0.0 MHz), 68.7 
kHz, 85.0 Hz
(II) I810(0): Modeline "1024x768"   94.50  1024 1072 1168 1376  768 769 772 
808 +hsync +vsync


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