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?