How to adjust the brightness in Linux Mint so that it does not jump when switching the battery charging mode?

Question

linux

Hello.
There is an old laptop. It has a dead battery with a maximum charge level close to 0%. The laptop is constantly connected to the outlet.
I installed Linux Mint 19.
I set the brightness through "System Settings - Power Management - Battery Power".
I set the brightness to my liking.
While the battery is charging, the brightness is maintained.
After 2 minutes, the battery stops charging. Power management switches to another mode (on battery). Brightness settings are reset to default values.
This mode (on battery power) lasts 5 seconds. Even if I manage to change the brightness, after 5 seconds the laptop switches to charging mode. And the brightness becomes default again.
And so in a circle.
How can I configure Linux Mint scripts to use the last custom brightness value when switching power mode?

Answer 1

why do you need such a battery with a 0% charge?
in the power settings, turn off the modes for the battery,
in fact, you don’t have it, that is. it does not hold the necessary power,
or the charge controller is lying