External monitor in X

[Kari Ruohonen <kari.ruohonen@saunalahti.fi>]

I have Dell Inspiron 7500 +SXGA (1400x1050) with potato installed. The LCD
is working just fine but can anybody point me to a source of information
or give some advice how I can configure external monitor to work under X
(3.3.6).
In console it works OK.

Thanks,

Kari