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Surface Pro battery drains quickly and NPU usage stays at 100% after Windows update

Khromov Nikita 1 Балл репутации
2025-10-27T16:38:45.1166667+00:00

After a recent Windows update on my Surface Pro, I noticed two major issues:

The battery drains significantly faster than before, even during light usage.

The NPU (Neural Processing Unit) is constantly running at 100% utilization, even when no AI-related tasks are active.

I’ve tried restarting the device, checking for background processes, and updating all drivers via Windows Update, but the problem persists. This behavior started immediately after the update and was not present before.

Has anyone experienced similar issues? Are there any known fixes or troubleshooting steps I can try to resolve this?

Windows для дома | Windows 11 | Обновление Windows
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  1. IGYQ 16,035 Баллы репутации Независимый помощник
    2025-10-27T19:13:07.8066667+00:00

    Hi!

    Welcome to Microsoft Q&A forum.

    Several Surface Pro users (especially with models featuring the Snapdragon X Elite / Plus or Intel Core Ultra chips) have reported the exact symptoms you describe. After the update, Windows introduced (or re-enabled) background AI components such as:

    • Windows Copilot Runtime,
    • Recall indexing (if supported), and
    • System-level NPU background inference for Studio Effects and Live Captions.

    A bug in the most recent update (KB5041237 / KB5040427 depending on your build) causes the NPU service (ai_runtime.exe or CopilotRuntimeBroker.exe) to remain active even when no AI task is running, pegging it at 100%.

    The only fix is a newer update. Microsoft has released an out-of-band (OOB) update for some Surface models to fix this.

    • Open Settings → Windows Update
    • Turn on Get the latest updates as soon as they’re available.
    • Click Check for updates.
      • Look for a patch like:
        • KB5042439 or Surface Firmware – 24.101.2025.x
    • Install it, reboot, and check Task Manager → NPU usage.

    If update is not available yet you can disable some services affecting battery life until hotfix arrives.

    Disable AI system services

    • Press Win + R, type services.msc, press Enter.
    • Locate and Stop + Disable these (if present):
      • Windows Copilot Runtime Service
      • Windows AI Host Service
      • Recall Indexer Service
      • Windows Studio Effects Service
    • Reboot your computer

    Reset power plan and NPU behavior

    Open PowerShell (Admin):

    powercfg /restoredefaultschemes

    Then reboot and check if NPU utilization drops after 2–3 minutes of idle.

    Final Option – Roll Back the Update

    • Go to Settings → Windows Update → Update history → Uninstall updates.
    • Select the latest cumulative update (installed around the time this started).
    • Uninstall → Reboot.
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