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setting 1280X1024 and refresh rate problem

The Control Center hasn't provide 1280X1024 for my samsung 19'' LCD monitor(including to setup refresh rate). I think i should config xfree86. could anyone tell me which steps i ought to do. Thanks.
[I'm using debian sarge]

First generate a modeline:
/usr/X11R6/bin/gtf 1200 1024 90 -x
(90 is the refresh rate, replace it with whatever you want/your monitor is able to do.)

Then put this line in your monitor section in your X config file (xorg.conf or XF86Config, dunno what debian uses)

This is my monitor section with a modeline for 1600x1200@90hz, as an example:

Code:

Section "Monitor"

    Identifier  "My Monitor"

    HorizSync  30.0 - 125.0

    VertRefresh 50.0 - 160.0

    Modeline "1600x1200@90" 332.05 1600 1632 2888 2920 1200 1221 1239 1261

EndSection

You could use the "gtf" program to generate modelines.
For example:
gtf 1280 1024 60 -x
will generate a modeline for 60hz refresh. I used this program to generate a modeline for my 1280x800 laptop.