This may be a duplicate of bug 316423, although you have a different
chipset from the two who have reported there (they also have different
ones).

It would be nice if you could:
- Test if this you can reproduce this in Jaunty, and if you can attach 
/var/log/Xorg.0.log [*]
- If you can't do the above, reproduce it with the xserver package 
xserver-xorg-core 
2:1.5.3+git20081216+server-1.5-branch.4970d757-0ubuntu0tormod1 for Intrepid 
from the PPA https://launchpad.net/~xorg-edgers/+archive/ppa . This should dump 
a backtrace in Xorg.0.log which will give details about what went wrong.

[*] The easiest way to do this is with a Live CD, e.g. the recently released 
alpha-4 (http://cdimage.ubuntu.com/releases/9.04/). If the computer freezes 
completely it can be hard to recover Xorg.0.log, though. You may try the 
following when running the LiveCD to be able to recover the file despite the 
crash:
- Try Ctrl+Alt+F2 to switch to a virtual terminal and copy the file to a 
removable media or different computer.
- Add
Section "ServerFlags"
       Option          "DontZap" "no"
EndSection
to your xorg.conf and log out and in again to restart the X-server. This may 
allow you to use Ctrl+Alt+Backspace to kill and restart the X-server when the 
problem happens. (Xorg.0.log will be moved to Xorg.0.log.old when the X-server 
restarts)
- Install the package openssh-server, set a password for the ubuntu-user and 
see if you can ssh in from another computer after the crash (if the computer 
does not reply to ping when it has crashed you don't need to try this). This 
may work better if the computer is connected to the network via ethernet than 
via wireless.

** Changed in: xserver-xorg-video-intel (Ubuntu)
       Status: New => Incomplete

-- 
Xorg crashed coming out of screensaver - log shows "[mi] EQ overflowing. The 
server is probably stuck in an infinite loop."
https://bugs.launchpad.net/bugs/322613
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