[Intel-gfx] how to disable dpst on linux?

[РоманМельник]

> It could be CABC (Content Adaptive Backlight Control) which is a similar
> technology but is implemented fully in hardware, in the panel. How you
> can disable (and IF you can disable it) depends completely on the hardware.
> 

It seems to be something at software level, because when I'm in BIOS, and
switching to the battery, the screen doesn't dimm