Engineer reverse-engineers projector TV's 10s wake lag to a cold-booting Linux board
banteg · x · 2026-10-23
banteg shares a hardware deep-dive: his Android projector TV's slow wake-up turned out to be two Linux boards (Android SoC + projector controller), an Android TV box and a laser/optics board talking over USB/GPIO. Sleep cuts 5V to the laser board, forcing a 10s cold boot on wake.
- He found a root-free userspace function vmute that kills the laser instantly while keeping both boards powered, recovering in under 1s.
- He wired the trigger into a previously disabled Google Assistant app — which then mysteriously resurrected itself, which he blames on Android's 'immune system' fighting his debloat.
- The attached diagram shows the full wake sequence: 15.3s from power button to PUBPOWERON broadcast, dominated by the controller board cold boot.
- He also replaced the stock launcher with a custom one showing his homelab status; neither Codex nor Claude refused any request.
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