linux-kernel - RE: [intel-pstate driver regression] processor frequency very high even if in idle

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Date:	Sun, 3 Apr 2016 23:14:21 -0700
From:	"Doug Smythies" <dsmythies@...us.net>
To:	<sedat.dilek@...il.com>
Cc:	"'Srinivas Pandruvada'" <srinivas.pandruvada@...ux.intel.com>,
	"'Rafael J. Wysocki'" <rafael.j.wysocki@...el.com>,
	"'Linux PM list'" <linux-pm@...r.kernel.org>,
	"'LKML'" <linux-kernel@...r.kernel.org>,
	'Jörg Otte' <jrg.otte@...il.com>
Subject: RE: [intel-pstate driver regression] processor frequency very high even if in idle

On 2016.03.04 22:14 Sedat Dilek wrote:
> On Sun, Apr 3, 2016 at 8:59 PM, Doug Smythies <dsmythies@...us.net> wrote:
>> On 2016.04.02 11:21 Sedat Dilek wrote:
>>> On Sat, Apr 2, 2016 at 7:19 PM, Jörg Otte wrote:
>>>> 2016-04-02 17:28 GMT+02:00 Srinivas Pandruvada wrote:
>>>>

> are you involved in the Ubuntu-OS? Developer for Canonical?

I try to help with Ubuntu as a community volunteer.
I am not a developer with Canonical.

... [cut]...

>> As far as I know the /etc/init.d/ondemand is working properly. It sets the acpi-cpufreq
>> driver to use the "ondemand" governor and it sets the intel_pstate driver to use the
>> "powersave" governor.
>>

> I haven't looked at this exactly.
> The ondemand-script is not saying to fall back to "powersave" in case
> of intel_pstate-driver (here on Ubuntu/precise).

It is likely that newer versions of /etc/init.d/ondemand script
were never backported to the older 12.04 precise release.
Why not? Well, because, as far as I know, that release never used the
intel_pstate driver by default and so never had to fall through
to the powersave alternative.

Earlier on this thread, Srinivas correctly asked Jörg what distribution
was being used, so as to hopefully make it easier to reproduce the issue.
If we want to continue this distro specific conversation, perhaps
we should move it off-list or to some Ubuntu specific forum.

... Doug