Coil Whine after Windows 11 26H2 version update (ASUS Vivobook 14 M1405)

Question

Coil Whine after Windows 11 26H2 version update (ASUS Vivobook 14 M1405)

3elwa 0

Hi everyone,

I noticed a very faint & low volume buzzing sound coming from my laptop, I can only hear it when I put my ear right next to the keyboard or bottom vents.

When observing from the bottom, the fan (on the right side) is completely quiet under normal use. The sound comes specifically from the center-left bottom vents, directly over the motherboard components.

The sound is completely silent or almost inaudible on battery power, but becomes slightly more noticeable as soon as I plug in the AC charger. but its still ccompletely inaudible from a normal typing/seated distance.

My battery is capped at 80%, and Windows Power Mode is set to Balanced.

The sound buzzes loudly when I do demanding tasks like video editing or photoshop.

From what I’ve read, this seems like standard VRM/power inductor coil whine (vibrating under higher power state loads), but I wanted to get a second thought from the community.

Is this normal behavior for modern Vivobooks or slim laptops in general? Has anyone else noticed this?

Thanks!

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1 answer

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Answer 1

Hello,

Welcome to the Microsoft Q&A forum!

Your assessment is spot-on: what you are describing is classic coil whine coming from the Voltage Regulator Modules (VRMs) and power inductors on the motherboard.

Here is why this happens, why it seems linked to the recent update, and what you can do about it:

Why It Behaves This Way

AC Power vs. Battery: On battery power, your CPU and GPU operate within tighter power envelopes, drawing fewer amps. When plugged into AC power, the power delivery circuit switches to higher-draw power states (P-states and C-states), pushing higher current through the chokes and inductors. The magnetic fields cause the tiny coils inside those inductors to vibrate at frequencies that become audible as faint buzzing or hissing.
Heavy Workloads (Photoshop/Editing): High-load tasks force rapid frequency changes and voltage fluctuations across the VRM stages, intensifying the electromagnetic vibration.
The OS Update Factor: Major Windows 11 feature updates frequently introduce updated CPU power delivery profiles, AMD chipset drivers, and dynamic core-parking behavior. Changes in how aggressively Windows shifts the processor between idle (C-states) and boost states often make coil whine more noticeable after an update.

Is It Normal or Harmful?

Completely Harmless: Coil whine is purely an acoustic side effect of modern, high-density power delivery components squeezed into slim chassis like the ASUS Vivobook. It causes no physical damage, does not shorten the lifespan of your motherboard, and does not degrade system performance.
Normal Occurrence: Because slim laptops lack thick acoustic dampening material near the bottom intake vents, hearing a faint buzz when your ear is close to the chassis or under heavy load is very common.

How to Mitigate the Noise

If you want to minimize the buzz, try the following adjustments:

Update AMD Chipset Drivers: Open the MyASUS app or visit the ASUS Support page for the M1405. Ensure you have installed the latest AMD Chipset Driver package released for your Windows 11 build to ensure smooth power state stepping.
Adjust Power Profiles in MyASUS: In the MyASUS app, toggle between Standard Mode and Whisper Mode. Whisper Mode applies smoother voltage curves that often quiet down aggressive inductor vibration.
Check the Windows Power Mode: Go to Settings > System > Power & battery. Setting the power mode to Best power efficiency or keeping it on Balanced (rather than Best performance) reduces idle voltage spikes when plugged into AC.

As long as the noise is only audible right next to the vents and during heavy export loads, your Vivobook is completely fine and operating within normal hardware parameters.

If this explanation gives you peace of mind, please click "Yes" and kindly upvote the response. Thanks