Adding old intel cpu patch to kernel

Hello All. First post.

I am running 9.2, compiled with support for older intel graphics on a decommissioned hp desktop. I recently did a cpu upgrade and now require to implement this patch for it to work properly.

intel_idle: Support C-states for Intel Core 2 family 6, model 23 CPUs.

I followed the general instructions in this thread but when I run the command

PROJECT=Generic ARCH=x86_64 ./scripts/build linux

I end up with

   APPLY PATCH (project)      projects/Generic/patches/linux/intel-idle.patch
patching file drivers/idle/intel_idle.c
Hunk #1 succeeded at 54 (offset -12 lines).
Hunk #2 succeeded at 112 (offset -12 lines).
Hunk #3 succeeded at 1016 (offset -10 lines).
Hunk #4 FAILED at 1120.
1 out of 4 hunks FAILED -- saving rejects to file drivers/idle/intel_idle.c.rej

Any pointers as to what is going wrong? I have edited the patch to match the INTEL CPU format in the existing intel_idle.c but I still run into the same error. The CPU runs at max and fans at 100% until I can figure this out.

Update: It turned out to be some errant whitespace. Once removed, I was able to patch the kernel and have the processor supported better.

Initially, I got this message

intel_idle: does not run on family 6 model 23

That has now changed to,

intel_idle: Please enable MWAIT in BIOS SETUP

The HP BIOS is very limited and does not expose such an option in the setup.

LibreELEC:~ #  cat /sys/devices/system/cpu/cpuidle/current_driver
none

No driver is reported active, as was the case before applying the patch, however, the processor now appears to be running at 80%, as opposed to max.

Is there a way to activate acpi_idle instead?

Update: A microcode update, combined with adding

intel_idle.max_cstate=2

to my boot configuration, sorted out my specific issue