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  • v12.89 9e466b8a70
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    fix(pcie): stop misreporting empty/vanished slots as speed degradation

    mchus released this 2026-08-26 12:44:57 +03:00 | 37 commits to main since this release

    pcie-link's retrain check compared post-retrain speed against a port's
    max capability without checking whether anything was actually seated
    downstream. A switch downstream port with no card plugged in retrains
    to zero lanes but still reports a reset-state speed, so it was
    misreported as "retrained to Gen1, capable of Gen5" — indistinguishable
    from a real degraded link.

    Now a port that was already empty before the retrain is skipped (same
    treatment as a disabled device: legitimately unpopulated slots are
    common and shouldn't fail the check), while a device that answered
    before the retrain and disappeared right after it still fails, with an
    honest "no device detected downstream" message instead of a fabricated
    speed reading.

    Co-Authored-By: Claude Sonnet 5 noreply@anthropic.com

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