Bug#638913: [PATCH] linux-source-3.0.0/drivers/cpufreq/speedstep-centrino.c

[Jonathan Nieder <jrnieder@gmail.com>]

Hi,

Grzegorz Kochański wrote:

> Additional settings for thinkpads Intel M Processors.

It is best to credit the original author and mention where the patch
came from.  IIUC this patch is by Christophe Dumez and can be found
at
http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-maverick.git;a=commitdiff;h=23120eb5a

Unfortunately, at https://bugzilla.kernel.org/show_bug.cgi?id=7463 we
see:

	Comment #13 From Andrew Morton 2007-10-18 13:44:59
	I asked davej about this and he said:

	The only safe way to use scaling on 'dothan' cores is with ACPI.
	We just have no way to tell which of the four sets of voltages
	is in use.  People keep proposing patches to hardcode a set of
	tables for them which "works for them", but could do *anything*
	on someone elses system.
	Even if we added it as a CONFIG option, I'm worried that
	people will turn it on not understanding the consequences
	and either plague us with crappy bug reports of flaky kernels
	(or worse).
	(And you guarantee some distros will turn it on to
	 "make hardware 'just work'")

	All-round crappy situation really, we're between a rock
	and a hard place, and ACPI is the best hope we've got.

Has Ubuntu been using this patch without trouble?