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intel_pstate vs acpi-cpufreq freq scale

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  intel_pstate vs acpi-cpufreq freq scale Julian Brooks <jbeezez@gmail.com> - 2017-01-16 02:20 +0100
    Re: intel_pstate vs acpi-cpufreq freq scale Luis Felipe Tabera Alonso <luisfe@lftabera.es> - 2017-01-16 16:20 +0100
      Re: intel_pstate vs acpi-cpufreq freq scale Julian Brooks <jbeezez@gmail.com> - 2017-01-17 00:50 +0100
        Re: intel_pstate vs acpi-cpufreq freq scale Julian Brooks <jbeezez@gmail.com> - 2017-01-18 02:50 +0100

#176736 — intel_pstate vs acpi-cpufreq freq scale

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Hi all,

I've got a new machine:
LENOVO ThinkPad X230 i5 23252GG
To replace my ol' trusty x61s.

Fresh install of Sid, with
liquorix 4.9-3 (2017-01-07) x86_64 kernel (for RT audio work).
Have also installed linrunner's TLP.

My understanding is that the x230's Ivy Bridge processor should make use of
intel_pstate for frequency scaling but I can't seem to load the kernel
module at boot.

TLP (and other sources) are telling me the system has acpi-cpufreq running
the frequency scaling.

Have tried adding 'intel_pstate=enable' to grub (+ update-grub), no change
(liquorix should load intel_pstate by defualt anyway, according to the
docs).
Have blacklisted the acpi-cpufreq module (which leaves me without any
scaling - unsurprisingly:).
Installed & uninstalled cpufreqtools & sysfsutils - no change either way.

And am now going round in (ever frustrating) circles with this.

Any advice gratefully received, and hope I've provided enough info - please
let me know if not.

Regards to all,

Julian

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#176753

On lunes, 16 de enero de 2017 1:13:09 (CET) Julian Brooks wrote:
> Hi all,

Hi Julian,

> Fresh install of Sid, with
> liquorix 4.9-3 (2017-01-07) x86_64 kernel (for RT audio work).
> Have also installed linrunner's TLP.

Have you tried to see if this happens with debian's official kernel?

> My understanding is that the x230's Ivy Bridge processor should make use of
> intel_pstate for frequency scaling but I can't seem to load the kernel
> module at boot.

Is it a module? At least on debian kernels, intel_pstate is inside the kernel, 
not as a separate module.

$ grep -i pstate config-4.8.0-2-amd64
CONFIG_X86_INTEL_PSTATE=y

however, on liquorix

$ grep -i pstate config-4.9.0-3.2-liquorix-amd64
# CONFIG_X86_INTEL_PSTATE is not set

So it seems that liquorix kernel has not compiled intel_pstate. So could try 
to recompile it as a module for your running kernel of rebuild liquorix kernel 
with intel_pstate support.

Luis

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#176769

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Dear Luis,

Many thanks for your input and guidance here.

'Have you tried to see if this happens with debian's official kernel?'
Doh! Of course.
Yes I have now, and intel_pstate is active - yay.

Complete newb with any kind of kernel config/tweaking/rebuilding - need to
do some reading-up.

Thanks again,

Julian

On 16 January 2017 at 15:03, Luis Felipe Tabera Alonso <luisfe@lftabera.es>
wrote:

> On lunes, 16 de enero de 2017 1:13:09 (CET) Julian Brooks wrote:
> > Hi all,
>
> Hi Julian,
>
> > Fresh install of Sid, with
> > liquorix 4.9-3 (2017-01-07) x86_64 kernel (for RT audio work).
> > Have also installed linrunner's TLP.
>
> Have you tried to see if this happens with debian's official kernel?
>
> > My understanding is that the x230's Ivy Bridge processor should make use
> of
> > intel_pstate for frequency scaling but I can't seem to load the kernel
> > module at boot.
>
> Is it a module? At least on debian kernels, intel_pstate is inside the
> kernel,
> not as a separate module.
>
> $ grep -i pstate config-4.8.0-2-amd64
> CONFIG_X86_INTEL_PSTATE=y
>
> however, on liquorix
>
> $ grep -i pstate config-4.9.0-3.2-liquorix-amd64
> # CONFIG_X86_INTEL_PSTATE is not set
>
> So it seems that liquorix kernel has not compiled intel_pstate. So could
> try
> to recompile it as a module for your running kernel of rebuild liquorix
> kernel
> with intel_pstate support.
>
> Luis
>

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#176794

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After some discussion with Liquorix people (who are still not convinced by
intel_pstate)
http://techpatterns.com/forums/viewtopic.php?p=12509#12509
I'm going to try out the new 'schedutils' option with acpi-cpufreq

See how it goes eh.

Regards,

Julian

On 16 January 2017 at 23:49, Julian Brooks <jbeezez@gmail.com> wrote:

> Dear Luis,
>
> Many thanks for your input and guidance here.
>
> 'Have you tried to see if this happens with debian's official kernel?'
> Doh! Of course.
> Yes I have now, and intel_pstate is active - yay.
>
> Complete newb with any kind of kernel config/tweaking/rebuilding - need to
> do some reading-up.
>
> Thanks again,
>
> Julian
>
> On 16 January 2017 at 15:03, Luis Felipe Tabera Alonso <luisfe@lftabera.es
> > wrote:
>
>> On lunes, 16 de enero de 2017 1:13:09 (CET) Julian Brooks wrote:
>> > Hi all,
>>
>> Hi Julian,
>>
>> > Fresh install of Sid, with
>> > liquorix 4.9-3 (2017-01-07) x86_64 kernel (for RT audio work).
>> > Have also installed linrunner's TLP.
>>
>> Have you tried to see if this happens with debian's official kernel?
>>
>> > My understanding is that the x230's Ivy Bridge processor should make
>> use of
>> > intel_pstate for frequency scaling but I can't seem to load the kernel
>> > module at boot.
>>
>> Is it a module? At least on debian kernels, intel_pstate is inside the
>> kernel,
>> not as a separate module.
>>
>> $ grep -i pstate config-4.8.0-2-amd64
>> CONFIG_X86_INTEL_PSTATE=y
>>
>> however, on liquorix
>>
>> $ grep -i pstate config-4.9.0-3.2-liquorix-amd64
>> # CONFIG_X86_INTEL_PSTATE is not set
>>
>> So it seems that liquorix kernel has not compiled intel_pstate. So could
>> try
>> to recompile it as a module for your running kernel of rebuild liquorix
>> kernel
>> with intel_pstate support.
>>
>> Luis
>>
>
>

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