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

[Andrea Bravetti]

"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.

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1472968

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.