Laptops also optimize for displaying a fully static screen. It's called "Panel Self Refresh" or "PSR". https://hardwaresecrets.com/introducing-the-panel-self-re

Laptops also optimize for displaying a fully static screen. It's called "Panel Self Refresh" or "PSR". https://hardwaresecrets.com/introducing-the-panel-self-refresh-technology/ https://hardwaresecrets.com/introducing-the-panel-self-refre... On my laptop, I can check if it is enabled with: cat /sys/kernel/debug/dri/0000:c1:00.0/eDP-1/psr_state cat /sys/kernel/debug/dri/0000:c1:00.0/eDP-1/psr_capability