Extreme background noise with Dell Hub Monitors (P2422HE) when Noise Suppression is off

Hi @Cole Baker, 

Thank you for the detailed report regarding the audio interference on the Dell P2422HE.

Based on your findings, the "wind" sound is likely electromagnetic interference (EMI) from the monitor’s power system, which becomes audible when Microsoft Teams' software filtering is disabled. I’ve outlined the causes and recommended next steps below to help improve your audio experience.

This noise originates within the monitor’s hardware and represents a physical limitation rather than a software defect. Because the "Off" setting in Teams acts as a raw bypass, it fails to filter hardware-level artifacts that are typically absent in studio-grade environments. To resolve this, I recommend switching your noise suppression to "Auto" or "Low" to effectively isolate the electronic hum. These settings provide the specific filtering that the raw bypass mode lacks for your current hardware configuration.

To further stabilize your setup, I recommend the following actions:

1/ Please update the monitor firmware to the latest available version. 

I suggest checking the Dell Support website to ensure your hardware is up to date. These updates often improve USB-C controller stability and reduce peripheral interference.

2/ I recommend testing the audio device by connecting it directly to your laptop. 

Please try using a laptop USB port rather than the monitor hub. If the noise disappears, it confirms that the monitor is the source of the electrical interference.

3/ Connect the audio device directly to your laptop’s USB port instead of through the monitor hub.

If the noise disappears, that suggests the monitor hub may be introducing the interference.

4/ Reaching out to your IT admin to open a support ticket. 

If this issue is widespread across your organization, a ticket through the Microsoft 365 Admin Center allows technical teams to investigate if a specific hardware batch or configuration is at fault. For detailed instructions on how to get support, please refer to Get support - Microsoft 365 admin. 

I hope these insights help clarify the behavior of your hardware and software. Please feel free to reach out if you have any further questions.

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Teams noise suppression is designed to clean up typical environmental sounds (paper, doors, fans, etc.) and can be turned fully off so that the application does not apply suppression. When Noise suppression is set to Off, Teams does not attempt to correct or mask hardware‑level interference; it simply passes through what the audio device and Windows provide.

In this scenario, the loud “wind” noise when connected through Dell P2422HE hub monitors indicates an issue with the USB audio path or the monitor’s audio hardware, not a Teams‑specific bug. When Noise suppression is turned On, Teams’ processing masks that interference; when Off, the interference is fully exposed.

From the product perspective:

• Noise suppression can be toggled in Teams, but the feature is not intended to compensate for faulty or noisy audio hardware.
• Teams Rooms on Windows does have a set of known hardware issues, but the documented items relate to coordinated meetings and touch/console behavior, not to USB hub monitors or audio noise, and there is no listed known issue that matches Dell P2422HE hubs specifically.

Practical implications:

1. The behavior with Dell hub monitors is consistent with hardware or driver interference on the USB audio path rather than a known Teams defect.
2. The Off setting is working as designed (no suppression), so any severe noise at that point must be addressed at the device/driver level (monitor firmware, PC audio/USB drivers, cabling, or replacing the hub/monitor), not via Teams configuration.
3. For affected users who must stay on these hubs, keeping Noise suppression turned On in Teams is the viable software‑side mitigation.

References:

• Reduce background noise in Microsoft Teams meetings
• Known issues with Teams Rooms on Windows