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

Hello 3elwa,

The behavior may be consistent with coil whine, but the timing alone does not confirm that Windows 11 26H2 caused it.

To help separate a Windows-related change from a hardware characteristic, could you restart the laptop, enter the BIOS, and check whether the same buzzing can be heard there while the charger is connected? If it is also present in the BIOS, the sound is likely independent of Windows.

Please also check Settings > Windows Update > Update history and share the exact update or KB number installed before the sound appeared. Updating the BIOS, firmware, and chipset drivers from the ASUS support page for the exact M1405 model would also be worth checking.

If the noise becomes audible at a normal seated distance, grows noticeably louder over time, or is accompanied by unusual heat or instability, I recommend having ASUS Support examine the device rather than assuming it is harmless. Thank you so much for your understanding.     

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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

1. 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.
2. Heavy Workloads (Photoshop/Editing): High-load tasks force rapid frequency changes and voltage fluctuations across the VRM stages, intensifying the electromagnetic vibration.
3. 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:

1. 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.
2. 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.
3. 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