I have this same error in dmesg on a Dell Inspiron 15z with a fresh
quantal install.  I tried the 3.7-rc2-racing kernel but it only boots
with acpi=off.  With the regular quantal 3.5 kernel its possible after a
number of retries to boot with acpi=noirq.  Booting with acpi=off does
not allow testing this bug.  I'll mark this bug as Confirmed with the
kernel-unable-to-test-upstream tag.

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

** Tags removed: needs-upstream-testing
** Tags added: kernel-unable-to-test-upstream

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https://bugs.launchpad.net/bugs/1071353

Title:
  ACPI Warning: 0x0000000000000460-0x000000000000047f SystemIO conflicts
  with Region \PMIO 1 (20120320/utaddress-251)

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