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[MMlosh <1268340@xxxxxxxxxxxxxxxxxx>]

Did I miss any piece of missing information?

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

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https://bugs.launchpad.net/bugs/1268340

Title:
  [regression]ACPI tables parsing issue (WARNING in dmesg, no
  /proc/acpi, no display DPMS, no ATX power off)

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Occurs on:
  13.10 Saucy  (linux 3.11)
  14.04-dev  (linux 3.13)

  Does not occur on:
  all previous releases since 2008 or so

  The machine has  2   PentiumIII  processors
  It's BIOS dates back to 1999, but till now it worked well with acpi=force

  There is a warning in DMESG that seems ACPI-related
  WARNING: CPU: 0 PID: 0 at /build/buildd/linux-3.13.0/arch/x86/mm/ioremap.c:536 __early_ioremap+0x13c/0x1ce()
  -- snip --
   [    0.000000]  [<c19b37d4>] early_ioremap+0x1a/0x1c
   [    0.000000]  [<c19ab389>] __acpi_map_table+0x14/0x19
  -- snip --

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