Re: [stable] [PATCH 1/2 2.6.37.stable] intel_idle: disable NHM/WSM HW C-state auto-demotion

[Len Brown <lenb@kernel.org>]

On Wed, 23 Mar 2011, Greg KH wrote:

> On Tue, Mar 22, 2011 at 10:24:43PM -0400, Len Brown wrote:
> > From: Len Brown <len.brown@intel.com>
> > 
> > upstream 14796fca2bd22acc73dd0887248d003b0f441d08
> > 
> > Hardware C-state auto-demotion is a mechanism where the HW overrides
> > the OS C-state request, instead demoting to a shallower state,
> > which is less expensive, but saves less power.
> > 
> > Modern Linux should generally get exactly the states it requests.
> > In particular, when a CPU is taken off-line, it must not be demoted, else
> > it can prevent the entire package from reaching deep C-states.
> > 
> > https://bugzilla.kernel.org/show_bug.cgi?id=25252
> > 
> > Signed-off-by: Len Brown <len.brown@intel.com>
> 
> This patch doesn't apply to the .38-stable tree, and it also needs to go
> there, right?  Can you please send a version that I can apply?

it is already present in 2.6.38, as is the next one.
That is why the subject specified 2.6.37.stable.

thanks,
-Len