Reading /usr/share/doc/xserver-xorg-video-intel$ zcat README.gz | less
- EXA support unstable on i845.

This seems to explain why:
        Option "NoAccel" "true"
seems to fix your problem.

But I would suggest you to replace that line by:
        Option "AccelMethod" "XAA"

taken from man intel

EXA have replaced XAA.
But since you are using using integrated videocard based on i845 chipset, seems 
like you should use XAA.
I am unsure if XAA is really stable however...
I think I remember a time where Virtual Terminal where not working with it. 
(Ctrl-Alt-[1-6]).
A long time ago.
And because this was the time intel was switching to use EXA, not sure it has 
been fixed.

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jaunty 2.6.28-4 gdm hangs on IBM NetVista
https://bugs.launchpad.net/bugs/312332
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