From mboxrd@z Thu Jan  1 00:00:00 1970
From: Steven Rostedt <rostedt@goodmis.org>
Subject: Re: CpuFreq Laptop Scaling broken?
Date: Mon, 25 Aug 2014 10:10:55 -0400
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Cc: Harry van Haaren <harryhaaren@gmail.com>,
	linux-rt-users@vger.kernel.org,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Thomas Gleixner <tglx@linutronix.de>
To: Viresh Kumar <viresh.kumar@linaro.org>
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On Mon, 25 Aug 2014 19:25:28 +0530
Viresh Kumar <viresh.kumar@linaro.org> wrote:


> > # Attempt to set min freq of 2GHz (max) of this core2duo
> > $ echo 2000000 > /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq
> > bash: /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq: Permission denied
> 
> You tried both these as root? Even 'sudo' may not work..
> 
> I haven't seen the rt code since sometime, what tag should I look at ?
> 

Can you also try the matching vanilla kernel to see if that works? That
is, if you are using 3.14.12-rt9, build and boot 3.14.12 with the same
config (except change CONFIG_PREEMPT_RT_FULL to just CONFIG_PREEMPT)
and see if that doesn't work either.

-- Steve