OK, I'm asking #ubuntu-bugs and being told it's most likely a kernel
bug.  I think there's enough info here for a developer to look into it.
They might ask for more info when they do.

Oh, and please try with a Jaunty daily live cd, just to check it hasn't
been fixed yet.

** Changed in: acpi (Ubuntu)
       Status: Incomplete => Triaged

** Changed in: linux (Ubuntu)
Sourcepackagename: acpi => linux

** Description changed:

  I have a new Extreme Notebooks Raptor 560X with an Intel Montevina P9500
  chip.  32-bit Xubuntu Intrepid boots and installs fine.  64-bit Intrepid
  goes into a permanent reboot, and doesn't throw up any messages that I
  am able to read.
  
  I even used debootstrap on another system to create a 64-bit root on
  another system and installed it on a partition on this notebook.  It
  boots the kernel, and then when booting up goes into an automatic hard
  reboot.  It happens too fast for me to read the messages on the screen
  even in rescue mode.
+ 
+ Using mem=4096, only 3GB are detected, but it can boot properly.
+ Using acpi=off or acpi=ht, all for 4GB are detected, and it boots, but any 
ACPI events trigger a reboot.

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Ubuntu Kernel Team (ubuntu-kernel-team)

-- 
64-bit Intrepid automatic permanent reboot loop related to having exactly 4GB 
of memory
https://bugs.launchpad.net/bugs/272530
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