LightDM - Aug 2011 - How do I start a program when X starts?

I'm having some problems getting my composite manager (cairo-compmgr) to
start up with X when using LightDM. The Arch wiki recommends putting it in
.xinitrc (https://wiki.archlinux.org/index.php/Cairo_Compmgr#Configuration),
but neither that nor .xsession seem to run when I log in. What's the
recommend way to start a program when X starts when using LightDM?

I have a feeling this question comes from my own lack of general knowledge
around LightDM and X sessions, so please feel free to point me towards some
better reference documentation. I tried looking up docs on X, but I had a
hard time finding one centralized location that gave me an introduction to
the terms and concepts I should know when dealing with X.

Thanks,
Jonathan
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On Thu, Aug 18, 2011 at 02:14:14PM -0500, Jonathan Schuster
wrote:
> I'm having some problems getting my composite manager (cairo-compmgr)
to
> start up with X when using LightDM. The Arch wiki recommends putting it in
> .xinitrc
(https://wiki.archlinux.org/index.php/Cairo_Compmgr#Configuration),
> but neither that nor .xsession seem to run when I log in. What's the
> recommend way to start a program when X starts when using LightDM?
Does ~/.xprofile work?

I don't know why .xinitrc and .xsession don't work (or why we have three
files purporting to do the same thing...)

Bryce