I am trying to use Intel's P-State driver for my custom-built kernel (based on Linux 4.4.55). I have enabled the driver in the kernel configuration (by setting the
X86_INTEL_PSTATE flag to "
*"), but my kernel somehow still uses the old
ACPI_CPUFREQ driver. I have verified that
intel_pstate.c is compiled to
intel_pstate.o in the kernel sources (in
I think the
intel_pstate driver is enabled by default, but just in case I still tried adding
intel_pstate=enable to the
GRUB_CMD_LINE_DEFAULT variable in
/etc/default/grub.cfg. Nothing changed, however.
What should I do to enable the Intel P-State driver in my kernel? Why is this driver somehow not built-in?