Does your X server remain completely frozen? I mean, is it still
responsive to client requests? Does it still respond to the keyboard?
(e.g. does it die when you hit Ctrl+Alt+backspace? But note that for
this to work you will probably need to set Option "DontZap" "off" in
Section "ServerFlags").

In case it is really frozen and you have access to gdb, a backtrace at
the place it hangs would be useful.

It might also be interesting to know if some combination of the following 
Section "Device" options makes any difference:
> Option "NoAccel"
> Option "UseBIOS" "true" 
> Option "HWCursor" "false"
> Option "mclk" "0Hz"

-- 
Screen blanks and freezes after a few minutes of idling, possibly due to broken 
DPMS
https://bugs.launchpad.net/bugs/136853
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