From mboxrd@z Thu Jan  1 00:00:00 1970
From: rosslagerwall@gmail.com
Subject: Re: [stable request <=3.7] acpi-cpufreq: set current frequency based
 on target P-State
Date: Tue, 25 Mar 2014 22:18:03 +0000
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To: Vinson Lee <vlee@twopensource.com>
Cc: stable@vger.kernel.org, "Rafael J. Wysocki" <rjw@rjwysocki.net>, Viresh Kumar <viresh.kumar@linaro.org>, cpufreq@vger.kernel.org, linux-pm@vger.kernel.org, Len Brown <len.brown@intel.com>, "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>

On Tue, Mar 25, 2014 at 03:04:16PM -0700, Vinson Lee wrote:
> Hi.
> 
> Please backport upstream commit 8673b83bf2f013379453b4779047bf3c6ae387e4 
> "acpi-cpufreq: set current frequency based on target P-State" to stable 
> kernels 3.7 and earlier. This patch enables the kernel to control 
> P-states on several platforms. Without this patch, the kernel was unable 
> to control P-states on the same platforms.
> 
> The upstream patch cleanly applies to 3.7.
> 
> A backported patch is needed with the removal of SYSTEM_AMD_MSR_CAPABLE 
> for kernels 3.6 and earlier.
> 

I seem to recall that the problem was a regression introduced by commit
5a1c0228 (cpufreq: Avoid calling cpufreq driver's target() routine if
target_freq == policy->cur) which was introduced in the 3.8 cycle.  Are
you sure it is necessary for kernels < 3.8?

Regards
-- 
Ross Lagerwall