By enabling CONFIG_INTEL_PMC_CORE
or making a kmod-
package it's possible to achieve deeper package C-states on various Topton/Anyrevo softrouter mini-PCs
If you toggle SATA bit in ltr_enable, idle power consumption will go down
echo 2 > /sys/kernel/debug/pmc_core/ltr_ignore
There is also an interrupt that can be masked with
echo mask > /sys/firmware/acpi/interrupts/gpe6F