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I added a laptop-only waybar button that drops the machine into a low-power state and restores it on a second click. Engaging turns wifi off, sets the CPU energy-performance preference to power, dims the backlight to 35%, and stops network-only services (tailscale, proton-vpn, avahi, cups, wsdd, geoclue, sshd, fail2ban, syncthing). Bluetooth is left alone so earbuds keep working.
Disengaging replays the state recorded when airplane mode was engaged rather than writing hardcoded defaults. A lever already in its low-power position is left untouched: wifi that was already off stays off, and a service that was already stopped isn't restarted.
The indicator hides itself on machines with no battery, so desktops never show the button. State lives in $XDG_RUNTIME_DIR/airplane-state, and the bar refreshes the moment the toggle fires via a realtime signal.
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