How to Identify Background Timer Resolution Battery Drain Using ETW, WPA, and Powercfg
Legacy processes invoking timeBeginPeriod(1) force the OS interrupt tick to 1ms, preventing CPU packages from entering deep C-states (C8–C10) and driving severe battery discharge. By leveraging ETW traces, Windows Performance Analyzer, and powercfg diagnostics, developers can isolate parasitic background timers and restore hardware-intended idle efficiency.