Stop the screen from dimming when plugged in

[Guest TangerineTractor]

If you're like me and have the "stay awake" option checked to keep the screen on when plugged in, the dimming probably annoys you... especially in the car if you're using maps, or on your desk if you have a phone stand and charger...

Anyhow, I found Intelliscreen - it's free, and does a lot of clever stuff with sensors to keep the screen awake and stuff - I'm not using any of them, but I am using the peripheral settings option to keep the screen on when connected to a charger - if you then turn off Stay Awake in the Developer section of the phone settings, you don;t get any dimming when plugged in.