The on-battery toggle bought a fraction of a watt while the radio idled -- twenty-some minutes across a full discharge in the best case -- and paid for it with 20-300ms latency spikes on idle links and outright link drops on Intel BE200/BE211 firmware. NetworkManager can keep power save off natively with one conf.d line, which replaces the udev rule, the setter script, and any per-card deny-listing. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>