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Research notes: withdrawing the display PMP requests doesn't help on T600x - #4
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Three lid-closed sleeps on aurora9 by charge_counter: control 1987 mW, dispext0 withdrawn 2012 mW, disp0 + dispext0 withdrawn 1945 mW (current 163.0 vs 161.6 mA; the gap is mostly voltage). Unlike T6030's ~1.25 W, the display requests don't hold T600x s2idle up. Also notes energy_now jumping up 0.66-0.85 Wh in short sleeps and the hook's awake overhead. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Reviewed changes Reviewed the experiment results and measurement caveats added to RESEARCH.md.
- PMP A/B results: Records the three aurora9 battery sleeps and the conclusion that withdrawing the tested display requests produced no meaningful power saving.
- Measurement caveats: Explains the voltage contribution to the small power difference, upward
energy_nowjumps, and awake-time overhead in short runs.
Checked the voltage/current arithmetic, release-mask meanings, and hook sampling order against the existing tooling. The hardware measurements were not independently reproduced.
gpt-6.1-sol ｜ 𝕏
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Docs only (RESEARCH.md): the result of the PR #3 experiment.
Three lid-closed sleeps on battery (aurora9, radios off), measured by the coulomb counter:
The module withdrew and re-asserted the requests cleanly every time. The 42 mW gap in the last run is mostly the battery voltage dropping between runs: average current 163.0 vs 161.6 mA. On T600x, the display PMP requests don't hold s2idle power up, unlike T6030's ~1.25 W.
The notes also record that
energy_nowwent up 0.66–0.85 Wh in every short sleep with no charger attached, so it can't be used for short runs.After merging
Nothing to install.
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