Public bug reported:

I've been experiencing total system freeze, frequently (say once every 1-4 
hours), starting 25th Jan.
This system has been running intrepid since alpha 4 and has been very stable. 

When a freeze occurs my X display doesn't update, no response to mouse
or keyboard input, audio stops, can't ssh in, can't kill X or change
tty. The only fix is to do a power reset.

I can't see anything obvious in the logs (though I'm not sure what I'm
looking for). Memtest reports no problems, neither does fsck. I
typically update daily, so looking at my apt log I noticed updates to X
around that date. I've tried removing the proprietary ATI drivers, using
the driver suggested by envyng, reconfiguring xserver-xorg, with no
success.

$ uname -a
Linux pc559-ubu 2.6.27-11-generic #1 SMP Thu Jan 22 17:22:40 UTC 2009 i686 
GNU/Linux

$ cat /proc/version_signature 
Ubuntu 2.6.27-11.25-generic

$ lsb_release -rd
Description:    Ubuntu 8.10
Release:        8.10

** Affects: ubuntu
     Importance: Undecided
         Status: New

-- 
Intrepid random (but frequent) system freeze
https://bugs.launchpad.net/bugs/322563
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