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

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Message-ID: <1593264.QxQbtiBB9a@vostro.rjw.lan>
Date:	Sat, 28 Dec 2013 01:50:40 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	David Woodfall <dave@...oodfall.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

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 speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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