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[Colin Ian King <1524930@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

[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.

** Affects: linux (Ubuntu)
     Importance: Low
     Assignee: Colin Ian King (colin-king)
         Status: Incomplete

** Changed in: linux (Ubuntu)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Colin Ian King (colin-king)

** Description changed:

  [SRU Justification][Vivid]
  
- Users of Ubuntu wily are seeing a seemingly alarming kernel failure
+ 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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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:
  Incomplete

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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