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Operating Systems & Kernel•2026-10-24

First-Principles Hardware Sentinels: Electro-Thermal Protection and Zero-Grab Kernel Architecture

How CompasOS implements open-circuit resting voltage computation (Voc = Vterm + I * R) and evdev kernel interception to achieve 100% continuous appliance uptime.

1. Preventing Abrupt Voltage Cutoff Under Load

Portable edge appliances running local GPU or neural inference experience sudden current spikes. On aging lithium-ion cells, internal resistance causes terminal voltage to sag prematurely, triggering premature hardware BMS shutdown.

CompasOS implements real-time electro-thermal monitoring computing the true open-circuit voltage: Voc = Vterm + I * 0.150. An exponential moving average (EMA) filter triggers graceful hibernation to encrypted NVMe storage before BMS hardware disconnect.

2. Zero-Grab Evdev Input Interception

To guarantee continuous uptime when operating with closed lids or transitioning AC power cords, CompasOS replaces legacy desktop power daemons with direct evdev event monitoring on /dev/input/event0. Displays power down immediately to 0.00W while CPU cores maintain full execution.

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