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This mode is used if the intel_pstate=passive argument is passed to the kernel in the command line (it implies the intel_pstate=no_hwp setting too). Like in the active mode without HWP support, in this mode intel_pstate may refuse to work with the given processor if it does not recognize it.

https://www.kernel.org/doc/html/v4.12/admin-guide/pm/intel_pstate.html#passive-mode

I don't know what command line it is referring to. It could be the shell in bash, but I am assuming this is something you do in grub. In short; I am not sure.

Questions:

  1. How do I pass that argument, passive to intel_pstate in the kernel?
  2. How can I tell what the current value of intel_pstate is?
Pilot6
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Jannies - They do it for free
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1 Answers1

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In Ubuntu you can add kernel parameters in grub.

Edit /etc/default/grub and add e.g. intel_pstate=passive to GRUB_CMDLINE_LINUX_DEFAULT.

Example:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_pstate=passive"

To apply this setting run

sudo update-grub

It will be used after a reboot.

You can check the current state by

cat /sys/devices/system/cpu/intel_pstate/status
Pilot6
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  • Do I have to comment out GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"? – Jannies - They do it for free Dec 29 '20 at 13:06
  • No, leave it as is. You can also add your parameter there instead of GRUB_CMDLINE_LINUX. Like GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_pstate=passive". Do one or the other way. – Pilot6 Dec 29 '20 at 13:10
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    See https://askubuntu.com/a/780545/167850 It is better to add extra parameters to the latter, so the system can boot if you add something wrong. – Pilot6 Dec 29 '20 at 13:11