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

i33te
Member
Registered: 2017-04-05
Posts: 23

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 smile

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#2 2018-03-28 19:49:49

Head_on_a_Stick
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From: London
Registered: 2015-09-29
Posts: 8,759
Website

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

i33te wrote:

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?


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

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#3 2018-03-28 23:41:08

i33te
Member
Registered: 2017-04-05
Posts: 23

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)

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#4 2018-03-29 07:07:01

Head_on_a_Stick
Member
From: London
Registered: 2015-09-29
Posts: 8,759
Website

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.


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

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#5 2018-03-31 14:14:03

i33te
Member
Registered: 2017-04-05
Posts: 23

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

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#6 2018-03-31 19:13:39

Head_on_a_Stick
Member
From: London
Registered: 2015-09-29
Posts: 8,759
Website

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

i33te wrote:

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

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

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