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I am trying to disable de p-state and c-state drivers on my desktop, i did what is described in this topic: Disable CPU frequency scaling

Then i changed the grub-file:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_pstate=disable processor.max_cstate=1 intel_idle.max_cstate=0 idle=poll"

And after this i updated the grub and added governor="performance" in the cpufrequtils file.

Besides, I did all the aforementioned in another computer and they are working(i think), so this is the expected output for cpufreq-info:

PC where the changes took effect

And here is the output i get on this one:

PC where the changes were ignored

In the end it looks like this computer is ignoring the changes i'm doing, any idea why?

Moreover the uname-a displays the following:

In the PC i'm trying to change: Linux oai-test1 4.4.0-31-generic #50~14.04.1-Ubuntu SMP Wed Jul 13 01:07:32 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

In the PC the changes took effect: Linux oai-test2 3.19.0-61-lowlatency #69~14.04.1-Ubuntu SMP PREEMPT Thu Jun 9 10:15:00 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

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Joao Amaral
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  • Can you edit your question with the output of 'uname -a' from each computer along with system model number and make? – WinEunuuchs2Unix Nov 02 '16 at 14:57
  • Sorry what do you mean by system model number and make? – Joao Amaral Nov 02 '16 at 15:06
  • System model and make, is Dell Inspiron 17R 7720 AE. I would switch your kernel off if low latency to generic to fix the problem. – WinEunuuchs2Unix Nov 02 '16 at 17:11
  • Neither of your kernels are giving you protection from 'Dirty COW' security fix as they predate Oct 21/2016 – WinEunuuchs2Unix Nov 02 '16 at 19:39
  • Kernel 3.19 is very old and I'll have to research if it even includes Intel pstate support. If the machine isn't freezing I wouldn't even worry about Intel idling. – WinEunuuchs2Unix Nov 02 '16 at 19:42
  • the thing is i have to use this kernel, and it was installed in the computer the changes took effect. I am using Open Air Interface software and they require this OS and this kernel for support. – Joao Amaral Nov 03 '16 at 13:52
  • I understand completely. The solution is a different CPU if you can't get the freezing to stop. It is freezing up right? – WinEunuuchs2Unix Nov 03 '16 at 14:50
  • @WinEunuuchs2Unix Not freezing, in the computer that the changes took effect, the frequencies shown by i7z don't change more than 1Hz, and in this one they change a lot. And i'm sorry, the one with the 3.19 kernel is the one that the changes worked, and the kernel was installed after them. – Joao Amaral Nov 07 '16 at 15:07
  • @JoaoAmaral I see you came from oai too! I would like to know if you managed to fix it since I'm facing the same issue on my system too. I'm using the 4.40-79-generic kernel – RecursiveCursive Jun 15 '17 at 13:14

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