The "gtf" application that ships with XFree86 4.3 can generate
pretty good modelines.  For example:

$ gtf 800 600 75
  # 800x600 @ 75.00 Hz (GTF) hsync: 47.02 kHz; pclk: 48.91 MHz
  Modeline "800x600_75.00"  48.91  800 840 920 1040  600 601 604 627  -HSync +Vsync


                Mark.

On Sat, 17 Jul 2004, Patrick Dunford wrote:

> Running XFRee86 3.3.6, VectorLinux 1.8
> I want to set the screen refresh rate to 75 Hz at 800x600. This is
> supported by the monitor and known to work.
>
> What are the Modeline parameters for this? The monitor has a Horizontal
> frequency range of 31.5 - 48.3 kHz and a vertical frequency range of 50 -
> 100 Hz.
>
> There are Modeline entries for 56, 60, 72, 85 and 100 Hz but not 75.
>
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