I'm curious what the use case would be here, would anyone realistically want to be notified every single time the governor is changed?

An implementation hurdle I just reached was the fact that you cannot send a notification as root. This means auto clock speed would need to have a second, user level daemon or fork a new user level process to send notifications. hoodie/notify-rust#156

The solution I've found is to spawn a user process that is in charge of sending the notification https://stackoverflow.com/questions/28195805/running-notify-send-as-root

Seems like a lot of overhead just to send a notification, happy to implement some code which forks the process in the user space if we want to go through with this feature.

@JakeRoggenbuck @Shuzhengz thoughts?

Good solution! It's totally up to you if you wanna write the process part. Saw your PR and it looks good!