[XeTeX] issue with xetex and geometry

[Pablo Rodríguez]

Hi there,

I have TL 2007 installed on my Mandriva 2008.1 distribution, but I don't 
get the following document compiled as expected:

\documentclass{slides}
\usepackage{graphicx,color}
\usepackage[xdvipdfmx,screen,margin=1cm,noheadfoot,truedimen,mag=1500]{geometry}
\usepackage[no-math]{fontspec}
\setsansfont{SV Basic Manual}
\pagestyle{empty}

\begin{document}
\centering

\begin{slide}
This is a test and it should work as expected, shouldn’t it?.

Why doesn't it work?
\end{slide}
\end{document}

Text should be vertically and horizontally centered, but page size is 
wrong. What am I doing wrong?

Thanks,


Pablo