linux-kernel - Re: Problem with cpufreq and i5 since post 3.9.0

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Date:	Sat, 28 Dec 2013 01:23:45 +0000
From:	David Woodfall <dave@...oodfall.net>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	linux-kernel@...r.kernel.org,
	Viresh Kumar <viresh.kumar@...aro.org>,
	linux-pm@...r.kernel.org
Subject: Re: Problem with cpufreq and i5 since post 3.9.0

On (28/12/13 01:50), Rafael J. Wysocki <rjw@...ysocki.net> put forth the proposition:
>CC: +Viresh and linux-pm
>
>On Saturday, December 28, 2013 12:09:01 AM David Woodfall wrote:
>> On (27/12/13 19:53), Dave Woodfall <dave@...oodfall.net> put forth the proposition:
>> >On (27/12/13 20:44), Heinz Diehl <htd@...cy-poultry.org> put forth the proposition:
>> >>On 27.12.2013, David Woodfall wrote:
>> >>
>> >>>But any of the newer kernel versions I've tested only give me
>> >>>performance and powersave.
>> >>
>> >>I don't use any Fedora kernel, so I can't tell which governors are
>> >>enabled in those. You should check the value of "CONFIG_CPU_FREQ_GOV"
>> >>in the respective .config file for your installed kernel.
>> >>
>> >>In short: It seems that only "performance" and "powersave" are
>> >>compiled in.
>> >
>> >No, I used the same .config in all versions that I tested. I've also
>> >tried setting them as modules rather than built-in. This is the stock
>> >slackware .config:
>> >
>> >CONFIG_CPU_FREQ=y
>> >CONFIG_CPU_FREQ_TABLE=m
>> >CONFIG_CPU_FREQ_GOV_COMMON=y
>> >CONFIG_CPU_FREQ_STAT=m
>> >CONFIG_CPU_FREQ_STAT_DETAILS=y
>> ># CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set
>> >CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE=y
>> ># CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND is not set
>> ># CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE is not set
>> >CONFIG_CPU_FREQ_GOV_PERFORMANCE=m
>> >CONFIG_CPU_FREQ_GOV_POWERSAVE=m
>> >CONFIG_CPU_FREQ_GOV_USERSPACE=y
>> >CONFIG_CPU_FREQ_GOV_ONDEMAND=m
>> >CONFIG_CPU_FREQ_GOV_CONSERVATIVE=m
>> >
>> >And modprobing any governor module does not change the output of
>> >scaling_available_governors.
>> >
>> >-Dave
>>
>> I'm also experiencing this with a Intel G640 dual core machine.
>> Exactly the same effect.
>
>Do you have CONFIG_X86_INTEL_PSTATE set?

I did and unsetting it solves the problem.

Thanks for that pointer.

-Dave


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