#1 2018-03-28 18:33:51

i33te

Member

Registered: 2017-04-05

Posts: 17

acpi-cpufreq "unable" to call hardware"

hi there,
I have powertop tlp on the system, and the idle power on ac is pretty good but it SKYROCKETS when switching to battery-
Just wanted to just see what cpugovernor was in use.
So it looks like the service is not enabled on my machine ( likely running on kernelmode services? see below )

heres the output from cpupower freq info-

$ cpupower frequency-info
analyzing CPU 0:
  driver: acpi-cpufreq
  CPUs which run at the same hardware frequency: 0
  CPUs which need to have their frequency coordinated by software: 0
  maximum transition latency: 10.0 us
  hardware limits: 1.20 GHz - 2.40 GHz
  available frequency steps:  2.40 GHz, 2.40 GHz, 2.27 GHz, 2.13 GHz, 2.00 GHz, 1.87 GHz, 1.73 GHz, 1.60 GHz, 1.47 GHz, 1.33 GHz, 1.20 GHz
  available cpufreq governors: conservative powersave userspace ondemand performance
  current policy: frequency should be within 1.20 GHz and 2.40 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
[b]  current CPU frequency: Unable to call hardware
  current CPU frequency: 1.20 GHz (asserted by call to kernel)[/b]
  boost state support:
    Supported: yes
    Active: yes
    33999 MHz max turbo 4 active cores
    33999 MHz max turbo 3 active cores
    33999 MHz max turbo 2 active cores
    33999 MHz max turbo 1 active cores

thanks again for the insights as always

Head_on_a_Stick

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From: London

Registered: 2015-09-29

Posts: 8,493

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Re: acpi-cpufreq "unable" to call hardware"

Just wanted to just see what cpugovernor was in use

From the output it looks like ondemand, check with:

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

the idle power on ac is pretty good but it SKYROCKETS when switching to battery

Probably a measurement artefact, powwertop isn't very accurate — can you verify the usage independently?

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i33te

Member

Registered: 2017-04-05

Posts: 17

Re: acpi-cpufreq "unable" to call hardware"

i honestly dont know enough as to how to do that ( working knowledge of linux only)- id have to look into it further*

to clarify- yes the cpugovernor is on demand (confirmed)
no can't verify just yet independently

Last edited by i33te (2018-03-29 00:31:35)

Head_on_a_Stick

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From: London

Registered: 2015-09-29

Posts: 8,493

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Re: acpi-cpufreq "unable" to call hardware"

I wouldn't worry about it too much, the only way to accurately measure power consumption is with an external meter, any other methods are not at all reliable.

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“Et ignotas animum dimittit in artes.” — Ovid, Metamorphoses, VIII., 18.

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i33te

Member

Registered: 2017-04-05

Posts: 17

Re: acpi-cpufreq "unable" to call hardware"

thanks for the info

offside question- should i be worried about this little bit of the reply

current policy: frequency should be within 1.20 GHz and 2.40 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency: Unable to call hardware

Head_on_a_Stick

Moderator

From: London

Registered: 2015-09-29

Posts: 8,493

Website

Re: acpi-cpufreq "unable" to call hardware"

should i be worried about this little bit of the reply

I don't see why but perhaps check the journal for any glaring errors:

sudo journalctl -b

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“Et ignotas animum dimittit in artes.” — Ovid, Metamorphoses, VIII., 18.

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