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[Mutlu Can YILMAZ <mtlcnylmz@xxxxxxxxx>]

Same problem persists on Trusty.

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https://bugs.launchpad.net/bugs/1524930

Title:
  "ACPI PCC probe failed" message is an error message when it should be
  debug

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Vivid:
  Fix Released

Bug description:
  [SRU Justification][Vivid]

  Users of Ubuntu Vivid are seeing a seemingly alarming kernel failure
  message "ACPI PCC probe failed" when in fact it is just a debug
  message informing the kernel developers that a probe for an ACPI PCC
  mailbox was not successful (which is just a debug only message) and
  not a failure one needs to worry about.   This message is asked about
  frequently on askubuntu.com, so it is alarming quite a few users, c.f.
  : http://askubuntu.com/questions/708215/1-037533-acpi-pcc-probe-
  failed.

  This fix landed in Wily, and the driver with the alarming message only
  affects Vivid.

  [Fix]
  Upstream commit efd756daf4ddae3cec2404c4e0b680b7cfdd6a45 ("ACPI / PCC: Use pr_debug() for debug messages in pcc_init()")

  [Testcase]

  Boot a machine without the PCC feature, without the fix one sees the
  error message in the kernel log. With the fix, this error is now a
  warning.  Note: This only affects Vivid.

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