How to Change Cpu Scaling Driver to Intel_Pstate
I Have an iMac with an Intel(R) Core(Tm) I7 Cpu 870 @ 2.93Ghz (1 Physical, 4 Cores, 8 Threads) I Am on Ubuntu 18.04.3 Lts I Was Trying Miscellaneous Stuff...
I have an iMac with an Intel(R) Core(TM) i7 CPU 870 @ 2.93GHz (1 physical, 4 cores, 8 threads)
I am on Ubuntu 18.04.3 LTS
I was trying miscellaneous stuff (most of which I don't even remember) in an effort to change the CPU frequency because it was always fixed to 1.2GHz (minimum).
Currently the acpi-cpufreq driver is used:
$ cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_driver
acpi-cpufreq
acpi-cpufreq
acpi-cpufreq
acpi-cpufreq
acpi-cpufreq
acpi-cpufreq
acpi-cpufreq
acpi-cpufreq
and I want to switch back to intel_pstate but I don't know how to achieve this.
When trying to switch to acpi-cpufreq I added the kernel parameter intel_pstate=disable in my /etc/default/grub. I removed it and I did execute sudo update-grub but after reboot I still get that acpi-cpufreq is the scaling driver.
Any hints?
1 Answer
GENERAL ANSWER:
Open terminal and type:
sudo gedit /etc/default/grub
Then find line:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
And change it to:
GRUB_CMDLINE_LINUX_DEFAULT="intel_pstate=enable quiet splash"
Save file and run following command:
sudo update-grub
Restart system and check is it enabled by:
sys/devices/system/cpu/cpu*/cpufreq/scaling_driver
ANSWER FOR INTEL PROCCESORS BEFORE 2nd GEN:
I am sorry but you can not use intel_pstate on your proccesor. It is only compactiable with proccesors from Sandy Bridge(2nd) generation up. You can only use old CPUfreq with Intel i7 870
EXTRA INFO:
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