How to trigger a command on Linux when disconnected from power

[KitsuneNoBaka]

For udev rules you should add

ENV{POWER_SUPPLY_TYPE}=="Mains"

because there is alot of devices in SUBSYTEM=="power_supply" with envinriment POWER_SUPPLY_ONLINE, including usb

Improving battery life, TLP and Intel pstate

UDEV in SUBSYTEM=power_supply shows various event, even usbc connect and disconnect. So maybe it would be better if 90-on-battery.rules would monitor AC Mains not battery charged. Your syslog shows that after successful setting parameters for AC it sets parameters for Battery at the end. Another thing - with my test’s and some article on APM/ACPI it’s not too good to force CPU to low frequency because when it can’t bump frequency to do the job it stays longer in high power state and consume …