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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Tags added: kernel-da-key

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https://bugs.launchpad.net/bugs/1472968

Title:
  acpi-cpufreq should be built as module and not built-in

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  "acpi_cpufreq" should be built always as module and NEVER builtin
  because it prevent phc-linux being loaded, and also any other
  acpi_cpufreq replacement provided by the vendor if any.

  "phc-linux" is very important if you need to downvolt some cpu.

  It's important, especially for some ThinkPad notebook like the Edge 15
  0301-J4G that hang frequently over 100C because of buggy voltage
  regulation, even new, clean fan, etc...

  Since I can't see any problem building it as a module and it should not
  cause any regression it should be made even on 14.04 LTS, and for any
  future release.

  You can read about linux-phc here: http://www.linux-phc.org/forum

  Also having linux-phc in the default kernel would be great but it may
  need some work.

  Not asking to fix in the mainstream kernel somethink so specific and
  hardware bug related, but please please please don't force anyone has
  this problem to rebuild a custom kernel because it's very annoying, just
  build acpi_cpufreq as module and not builtin.

  -CONFIG_X86_ACPI_CPUFREQ=y
  +CONFIG_X86_ACPI_CPUFREQ=m

  Ubuntu is the only distro I use that has ACPI_CPUFREQ=y, should I move
  to Fedora or any other but Ubuntu?

  Also Debian has ACPI_CPUFREQ=m.

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