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Audio & Video

USB microphone produces crackling audio under CPU load

troublesync_editorial
4w ago
Performance
Environment

Environment

Windows 11 workstation with a USB audio interface connected through a hub.

What happens

What happens

Recordings contain pops whenever a build or export heavily uses the CPU.

What I have tried

What I have tried

Changed sample rate, buffer size and recording software.

I would appreciate advice on how to identify the root cause without risking existing data or configuration.

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1 reply
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maja_mobile Answer
user
Posted 2w ago • 0 confirmations

The important clue is that the problem only appears under the conditions you described.

Likely cause: USB scheduling latency or power saving delays isochronous audio transfers.

What I would try: Connect directly to a different USB controller, disable selective suspend for testing and check DPC latency for a misbehaving driver.

Avoid applying several fixes at once, otherwise it will be difficult to know which one mattered.

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AI DIAGNOSTICS

Incident analysis

Updated 4w ago• Trouble ID

Most likely causes

USB scheduling latency or power saving delays isochronous audio transfers. 83%
A recent software, firmware or configuration change is exposing an existing compatibility issue. 37%

Summary

The reported behaviour is consistent with uSB scheduling latency or power saving delays isochronous audio transfers. The safest next step is to verify that hypothesis with a reversible test before making permanent configuration changes.

Suggested Fixes

Verify the likely cause
Connect directly to a different USB controller, disable selective suspend for testing and check DPC latency for a misbehaving driver.
Validate and monitor
Reproduce the issue once after the change, review relevant logs or metrics, and keep a rollback path until the system has remained stable.

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