Introduction

  • The 12V-2x6 (12VHPWR) connectors are notorious for their flammability.
  • The ASUS ROG ASTRAL implementation of RTX 5090 monitors voltage and current
    flowing through connector pins.

  This project provides a native Linux implementation of the current monitoring
  functionality of ASUS ROG ASTRAL devices. The support is currently limited to
  ROG-ASTRAL-RTX5090-O32G devices.

  • The bin/susm binary implements a simple monitor.
  • The bin/susd binary implements a simple daemon that attempts to reduce the
    power draw when it detects either overload on any of the connectors pins or
    when there is a significant mismatch between individual wires.


Fork Additions

  • Desktop notifications via notify-send (-n flag)
  • Dry-run mode to disable throttling actions (-d flag)
  • MQTT metrics for Home Assistant integration

  Example usage:
    susd -n -d    Notify only, no throttling
    susd -n       Notify and throttle
    susd          Throttle only (original behavior)


MQTT Metrics

  Optionally publish aggregated metrics to an MQTT broker for long-term tracking
  in Home Assistant or similar. Data is buffered in-memory and flushed at the
  configured interval. Graceful shutdown (SIGTERM/SIGINT) flushes before exit.

  Flags:
    --mqtt-broker       MQTT broker URL (e.g., tcp://localhost:1883)
    --mqtt-user         MQTT username
    --mqtt-pass         MQTT password
    --mqtt-prefix       Topic prefix (default: susd)
    --metrics-interval  Flush interval (default: 5m)

  Example usage:
    susd -d -n --mqtt-broker tcp://localhost:1883 --mqtt-user user --mqtt-pass pass

  Published metrics (per device, per interval):
    • GPU power (avg, max)
    • Connector match ratio (avg, min)
    • Per-pin voltage, current, power (avg, max) for all 6 pins
    • Alert count

  Home Assistant autodiscovery configs are published on connect, so sensors
  appear automatically.