[Question] How can I dim screen after 20s inactivity when running on battery? tlp/sway/arch/chromebook

I think this could save me some battery time. I checked tlp but could not find anything related. In Sway config with swayidle maybe? All help appreciated.

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You could use swayidle and add a line to use either light or brightnessctl to dim and restore the brightness. Or just as I do turn off display after a certain time. This link should give you an idea. https://wiki.archlinux.org/title/Sway#Idle
- Brightnessctl is installed and works just need a way to read whether is on ac or battery.
  
  @JustineSmithies @rkk Should be able to read it from /sys/devices/ or with upower.